| 单词 | blastocyst |
| 例句 | In the days that follow, I like to think of my eggs in the laboratory, cells dividing, happily gathering into blastocysts. I flew to Greece and began solo IVF. Then the world shut down 2020-05-16T04:00:00Z Here’s a thought experiment: I’m standing in front of you holding a baby in one hand and a petri dish with a blastocyst in the other. Perspective | Why does ‘pro-life’ mean disregarding the actual lives of pregnant people? 2021-05-25T04:00:00Z A couple had made it as far as blastocyst stage by day five, meaning they were the most likely to result in pregnancy. Four years, 40 negative tests: why being young and infertile sucks 2015-06-06T04:00:00Z The app used words like zygote and blastocyst, which were not Pokémon names but developmental stages where brain stems or cell clusters form what would eventually become ears, kneecaps, nostrils, toes, lips and everything else. The Internet Thinks I’m Still Pregnant 2016-09-02T04:00:00Z Five fertilized, three made it to the blastocyst stage, and only one was normal, but it grew too slowly. Who can afford to get pregnant? IVF 'baby scholarships' raise a class issue 2018-11-28T05:00:00Z The investigators first established nine stem cell lines using cells removed from 7-day-old blastocyst embryos. First live birth of a chimeric monkey using embryonic stem cell lines 2023-11-09T05:00:00Z What about preimplantation models of human embryos that mimic the blastocyst stage of natural embryos—that is, the stage at which doctors transfer fertility-clinic embryos into a patient’s uterus? New Human Embryo Models Spark Needless Controversy 2023-07-13T04:00:00Z Scientists have previously spurred human stem cells to form structures that closely resemble the blastocyst, the embryonic stage that begins around 5 days after fertilization and implants in the womb. Biologists create detailed lab replicas of early human embryos 2023-06-16T04:00:00Z The outer layers of the developing embryo or blastocyst grow into the endometrium by digesting the endometrial cells, and healing of the endometrium closes up the blastocyst into the tissue. Concepts of Biology 2013-04-25T00:00:00Z Previously, both teams had managed to culture monkey blastocysts — balls of dividing cells — in Petri dishes for up to 20 days. Lab-Grown Monkey Embryos Reveal in 3-D How Organs Begin 2023-05-15T04:00:00Z The word ‘fetus’ refers to a specific gestational stage of development, as opposed to the zygote, blastocyst, or embryo stages. Opinion | The worst federal judge in America now has a name 2023-04-08T04:00:00Z The answer lies in a fact unknown to people outside the small circle of stem cell experts who generate blastocyst models. New Human Embryo Models Spark Needless Controversy 2023-07-13T04:00:00Z These imitation blastocysts, known as blastoids, help researchers probe events around implantation, which may be key to some infertility. Biologists create detailed lab replicas of early human embryos 2023-06-16T04:00:00Z The trophoblast secretes enzymes that allow implantation of the blastocyst into the endometrium of the uterus. Concepts of Biology 2013-04-25T00:00:00Z A week later, they placed the resulting blastocysts into a gel-like substance in small cylindrical containers and watched them grow for 25 days. Lab-Grown Monkey Embryos Reveal in 3-D How Organs Begin 2023-05-15T04:00:00Z They also contained many of the same types of cells genuine monkey blastocysts do and showed similar patterns of gene activity, suggesting they were faithful replicas. First mock monkey embryos may shine light on pregnancy milestones 2023-04-06T04:00:00Z Almost 90% of abortions occur within the first 10 weeks of pregnancy, during the blastocyst or embryonic stage, and more than half of U.S. abortions are medication abortions. A ban of abortion pill would violate human rights 2023-03-08T05:00:00Z One way in which researchers have tried to delve into events after the blastocyst stage is by producing ersatz embryos from mouse stem cells. Biologists create detailed lab replicas of early human embryos 2023-06-16T04:00:00Z He pointed out that the blastocysts, which came from fertility clinics, were going to be destroyed anyway. Paul Berg, scientific firebrand who pioneered genetic engineering, dies 2023-02-22T05:00:00Z In the second study, Tao Tan, a developmental biologist at Kunming University of Science and Technology in Yunnan, China, and his colleagues also generated blastocysts from cynomolgus monkey eggs and sperm. Lab-Grown Monkey Embryos Reveal in 3-D How Organs Begin 2023-05-15T04:00:00Z Not all merge properly with sperm to form early stage embryos, called blastocysts; and not all blastocysts are considered viable. Hope, Regret, Uncertainty: 7 Women on Freezing Their Eggs 2022-12-23T05:00:00Z Researchers have coaxed human stem cells to become blastocysts and even to mimic some aspects of gastrulation — when the early embryo organizes into distinct layers composed of different cell types. Mouse Embryos Grown without Eggs or Sperm 2022-08-26T04:00:00Z In mammals, the blastula forms the blastocyst in the next stage of development. Biology for AP Courses 2022-06-09T00:00:00Z Scientists had discovered that embryonic stem cells, basically a cluster of cells in a few-days-old embryo called a blastocyst, could turn into every kind of cell and organ in the body. Paul Berg, scientific firebrand who pioneered genetic engineering, dies 2023-02-22T05:00:00Z The blastocyst is formed next, which is a hollow ball of cells with another group of cells in the center. Miller & Levine Biology 2018-01-01T00:00:00Z The blastocyst, the email said, would have been a girl. Hope, Regret, Uncertainty: 7 Women on Freezing Their Eggs 2022-12-23T05:00:00Z In the United States, fertilized eggs are typically cultured to the blastocyst stage because this results in a higher pregnancy rate. Anatomy and Physiology 2013-06-19T00:00:00Z Figure 34.22 The rearrangement of the cells in the mammalian blastula to two layers—the inner cell mass and the trophoblast—results in the formation of the blastocyst. Biology for AP Courses 2022-06-09T00:00:00Z Other scientists devised substitutes for a crucial embryonic stage known as the blastocyst. Science’s 2021 Breakthrough of the Year: AI brings protein structures to all 2021-12-15T05:00:00Z The outer cells of the blastocyst will eventually become the tissues that attach to the placenta of the mother, and the inner cell mass will become the actual embryo. Miller & Levine Biology 2018-01-01T00:00:00Z Few people have an immediate sense of moral identification with a blastocyst. Opinion | For legal and ethical guidance on abortion, let’s look to Europe 2021-12-09T05:00:00Z At this developmental stage, the conceptus is referred to as a blastocyst. Anatomy and Physiology 2013-06-19T00:00:00Z When they were placed in contact with cells from the lining of the uterus that had been stimulated with hormones, about half attached and started to grow in the same way blastocysts would. Scientists use stem cells to create models of pre-embryos 2021-12-02T05:00:00Z These ersatz blastocysts aren’t real embryos, but some of them could offer an instructive—and less controversial—alternative. Science’s 2021 Breakthrough of the Year: AI brings protein structures to all 2021-12-15T05:00:00Z Moreover, the ersatz blastocysts “will be windows into this stage of human development,” says stem cell biologist Aryeh Warmflash of Rice University, who wasn’t connected to the work. Researchers re-create key human embryo stage in lab 2021-03-17T04:00:00Z Research involving human embryos and blastocysts is currently ineligible for federal funding in the U.S., and several states prohibit it outright. Pre-embryos made in lab could spur research, ethics debates 2021-03-17T04:00:00Z The blastocyst implants in the uterine wall, the trophoblasts fuse to form a syncytiotrophoblast, and the conceptus is enveloped by the endometrium. Anatomy and Physiology 2013-06-19T00:00:00Z A blastoid is a model for a blastocyst, a ball of cells that form within a week of fertilization and are about the width of a hair. Scientists use stem cells to create models of pre-embryos 2021-12-02T05:00:00Z A hollow ball harboring only a few hundred cells, the blastocyst implants into the uterus and is the first embryonic stage to feature specialized cells. Science’s 2021 Breakthrough of the Year: AI brings protein structures to all 2021-12-15T05:00:00Z The stage also initiates another momentous event: implantation, in which the blastocyst nestles into the uterine lining and begins to interact with the mother’s cells to build the placenta. Researchers re-create key human embryo stage in lab 2021-03-17T04:00:00Z Some scientists now use blastocysts donated from fertility clinics for research into the causes of infertility and congenital diseases. Pre-embryos made in lab could spur research, ethics debates 2021-03-17T04:00:00Z What would happen if the trophoblast did not secrete hCG upon implantation of the blastocyst? Anatomy and Physiology 2013-06-19T00:00:00Z We were on a mission to get good-quality blastocyst embryos to freeze because we wanted to be parents in the far-off future, not then. Perspective | We froze our embryos a decade ago when we weren’t ready to be parents. Here’s what happened next. 2020-02-07T05:00:00Z Then he will do repeated rounds of whole-genome sequencing of 10 of these blastocysts, which aims to reveal all mutations that differ from the genomes of the parents. Embattled Russian scientist sharpens plans to create gene-edited babies 2019-10-21T04:00:00Z The only source for human blastocysts is donated embryos originally generated for IVF treatments, which are scarce and carry hefty ethical baggage. Researchers re-create key human embryo stage in lab 2021-03-17T04:00:00Z The early embryo develops into a structure called the blastocyst, which implants in the lining of the uterus. Cell atlas reveals the landscape of early pregnancy 2018-11-13T05:00:00Z Menses would flush the blastocyst out of the uterus. Anatomy and Physiology 2013-06-19T00:00:00Z The group injected the host blastocysts with donor ES cells that harboured a genetic modification of interest, and implanted them into foster mothers. Absent forebrain replaced by embryonic stem cells 2018-10-09T04:00:00Z Of 13 eggs injected with sperm from a now-deceased northern white rhino, four developed into blastocysts, or early embryos. Hybrid white-rhino embryos created in last-ditch effort to stop extinction 2018-07-03T04:00:00Z Wu and his team took that discovery a step further and showed that when they stimulated cultured human ES cells with two molecular mixtures, the cells congregated into dead ringers for blastocysts. Researchers re-create key human embryo stage in lab 2021-03-17T04:00:00Z Cells from the outer layer of the blastocyst, called trophoblast cells, undergo differentiation. Cell atlas reveals the landscape of early pregnancy 2018-11-13T05:00:00Z The uterine mucosa would not envelop the blastocyst. Anatomy and Physiology 2013-06-19T00:00:00Z More than two decades ago, the laboratory that performed the current study devised a technique called blastocyst complementation, to circumvent these limitations in the immune system3. Absent forebrain replaced by embryonic stem cells 2018-10-09T04:00:00Z By contrast, mouse embryos lacking the same gene formed blastocysts and faltered only later. The labs growing human embryos for longer than ever before 2018-07-03T04:00:00Z But in roomier quarters, they converged into spheres that closely resembled blastocysts. Researchers re-create key human embryo stage in lab 2021-03-17T04:00:00Z Embryonic stem cell lines derived from human blastocysts. Pancreas regeneration 2018-05-15T04:00:00Z The embryos are then incubated until they either reach the eight-cell stage or the blastocyst stage. Anatomy and Physiology 2013-06-19T00:00:00Z Like blastocysts, blastoids form from inductive signals that originate from the inner embryonic cells and drive the development of the outer trophectoderm. Blastocyst-like structures generated solely from stem cells 2018-05-01T04:00:00Z In future work, Niakan hopes to examine the human genes that commit a tiny fraction of blastocyst cells to forming the embryo proper, as opposed to supporting tissues such as the placenta. The labs growing human embryos for longer than ever before 2018-07-03T04:00:00Z Polo’s and Wu’s groups demonstrated that their blastoids recapitulated many characteristics of human blastocysts. Researchers re-create key human embryo stage in lab 2021-03-17T04:00:00Z Generation of rat pancreas in mouse by interspecific blastocyst injection of pluripotent stem cells. Pancreas regeneration 2018-05-15T04:00:00Z As the blastocyst forms, the trophoblast excretes enzymes that begin to degrade the zona pellucida. Anatomy and Physiology 2013-06-19T00:00:00Z The derivation was considered successful if colonies appeared on passage 2 after blastocyst or blastoid plating. Blastocyst-like structures generated solely from stem cells 2018-05-01T04:00:00Z Right, the human oocyte, blastocyst, sperm and ES cell DNA methylation levels around these promoters are also shown. Chromatin analysis in human early development reveals epigenetic transition during ZGA 2018-05-01T04:00:00Z Making the clusters was inefficient, and those that did form showed several key differences from IVF-derived blastocysts. Researchers re-create key human embryo stage in lab 2021-03-17T04:00:00Z Then they are left in a petri dish to grow into what are called blastocysts. Social egg freezing is a numbers game that many women don't understand 2018-01-29T05:00:00Z The blastocyst typically implants in the fundus of the uterus or on the posterior wall. Anatomy and Physiology 2013-06-19T00:00:00Z Blastocysts were imaged 24 h after exposure. n = 10 independent blastocysts. Blastocyst-like structures generated solely from stem cells 2018-05-01T04:00:00Z In most mammals, the blastocyst implants into the uterus. Early embryos kept in check A widely accepted research guideline, codified into law in some countries, forbids growing blastocysts for more than 14 days—and all four groups abided by that limit with their blastoids. Researchers re-create key human embryo stage in lab 2021-03-17T04:00:00Z These findings suggest that targeting OCT4 in human embryos reduces both viability and quality of blastocysts. Genome editing reveals a role for OCT4 in human embryogenesis : Nature : Nature Research 2017-09-19T04:00:00Z However, if the endometrium is not fully developed and ready to receive the blastocyst, the blastocyst will detach and find a better spot. Anatomy and Physiology 2013-06-19T00:00:00Z Distinct sequential cell behaviours direct primitive endoderm formation in the mouse blastocyst. Blastocyst-like structures generated solely from stem cells 2018-05-01T04:00:00Z During IVF, of 100 fertilised eggs, fewer than 50 reach the blastocyst stage, 25 implant into the womb and only 13 develop beyond three months. UK scientists edit DNA of human embryos 2017-09-20T04:00:00Z Number of oocytes/embryos/blastocysts shown in bars; percentage shown above bars. Correction of a pathogenic gene mutation in human embryos : Nature : Nature Research 2017-08-01T04:00:00Z The type of chromosome gains and losses are indicated. b, Representative karyotype analysis by whole-genome sequencing of human blastocysts. Genome editing reveals a role for OCT4 in human embryogenesis : Nature : Nature Research 2017-09-19T04:00:00Z Figure 28.6 Implantation During implantation, the trophoblast cells of the blastocyst adhere to the endometrium and digest endometrial cells until it is attached securely. Anatomy and Physiology 2013-06-19T00:00:00Z Gardner, R. L. Flow of cells from polar to mural trophectoderm is polarized in the mouse blastocyst. Blastocyst-like structures generated solely from stem cells 2018-05-01T04:00:00Z The edited embryos developed similarly to the control embryos, with 50% reaching an early stage of development known as the blastocyst, in which the embryos contain different cell types. Biotechnology: At the heart of gene edits in human embryos : Nature : Nature Research 2017-08-01T04:00:00Z Number of oocytes/embryos/blastocysts shown in bars; percentage shown above bars. Correction of a pathogenic gene mutation in human embryos : Nature : Nature Research 2017-08-01T04:00:00Z However, a previous study showed that human embryos in which a non-essential gene was targeted exhibited rates of blastocyst formation similar to controls8. Genome editing reveals a role for OCT4 in human embryogenesis : Nature : Nature Research 2017-09-19T04:00:00Z The team allowed the fertilized cells to develop into blastocysts—the stage at which embryos are usually implanted into the mother during fertility treatments. First Human Embryos 'Edited' in U.S.—Get the Facts 2017-08-02T04:00:00Z J.K. completed the blastocyst complementation assays and the in uteri transfers. Blastocyst-like structures generated solely from stem cells 2018-05-01T04:00:00Z Injected blastocysts were then implanted into the uteri of pseudo-pregnant females. Effective combinatorial immunotherapy for castration-resistant prostate cancer : Nature : Nature Research 2017-03-19T04:00:00Z It remains unclear to what extent viable embryos under physiological conditions follow a tightly predetermined developmental plan or whether largely stochastic processes dominate before the formation of the first structures in the blastocyst. Somatic mutations reveal asymmetric cellular dynamics in the early human embryo : Nature : Nature Research 2017-03-21T04:00:00Z To determine the chromosome copy number, single or multiple blastomeres were biopsied from embryos at the cleavage stage and clumps of approximately five cells were microdissected from the trophectoderm of blastocysts. Genome editing reveals a role for OCT4 in human embryogenesis : Nature : Nature Research 2017-09-19T04:00:00Z The same team recently developed a technique that allows blastocysts to develop in the lab up to the legal limit of 14 days in the UK. Artificial 'embryos' created in the lab - BBC News 2017-03-02T05:00:00Z They injected various types of human pluripotent stem cell — which can develop into any cell type — into balls of cells called blastocysts that become embryos. Developmental biology: Human-pig embryo made : Nature : Nature Research 2017-01-31T05:00:00Z Owing to the limited number of observations, blastocyst quality in Fig. 2d was analysed by pooling grades A and B to compare them with all the other grades combined. Corrigendum: Towards clinical application of pronuclear transfer to prevent mitochondrial DNA disease : Nature : Nature Research 2016-07-26T04:00:00Z Before then, it funded chimaeric embryo studies as long as they did not use primate blastocysts. Illusory fears must not stifle chimaera research 2016-09-12T04:00:00Z The type of chromosome gains and losses are indicated. b, Representative karyotype analysis by whole-genome sequencing of human blastocysts. Genome editing reveals a role for OCT4 in human embryogenesis : Nature : Nature Research 2017-09-19T04:00:00Z These embryonic stem cells cluster together inside the embryo towards one end, forming the rudimentary embryonic structure known as a blastocyst. Artificial 'embryos' created in the lab - BBC News 2017-03-02T05:00:00Z NIH also wants to tighten its existing stem cell guidelines to prohibit studies that add human stem cells to primate embryos up to and including the blastocyst stage. NIH moves to lift moratorium on animal-human chimera research 2016-08-04T04:00:00Z This altered donor cell is then used to generate a blastocyst, or early-stage human embryo, that contains mitochondria from the healthy donor and nuclear DNA from the patient. Mutated mitochondria could hold back stem-cell therapies 2016-04-13T04:00:00Z The eggs are mixed with their partner's sperm to form early embryos, called blastocysts, and banked. First U.S. uterus transplant removed after complication 2016-03-09T05:00:00Z These findings suggest that POU5F1 targeting efficiency is high, and that only embryos with partial OCT4 expression are able to progress to the blastocyst stage. Genome editing reveals a role for OCT4 in human embryogenesis : Nature : Nature Research 2017-09-19T04:00:00Z The eggs are mixed with their partner's sperm to form early embryos, called blastocysts, and banked, said Rebecca Flyckt, another obstetrician-gynecologist who was part of the team. Surgeons describe first uterus transplant in the United States 2016-03-07T05:00:00Z This may prove useful in treating certain cases of infertility, given that many fertilized eggs fail before they reach the blastocyst stage. British Researcher Gets Permission to Edit Genes of Human Embryos 2016-02-01T05:00:00Z Of 100 fertilised eggs, fewer than 50 reach the blastocyst stage, 25 implant into the womb and only 13 develop beyond three months. Kathy Niakan: Scientist makes case to edit embryos - BBC News 2016-01-13T05:00:00Z For approximately 14 days we were a single blastocyst that randomly split. What If My Life Had Taken a Different Turn? 2015-10-15T04:00:00Z The lack of expression of genes associated with all three lineages in the blastocysts suggests that OCT4-targeted embryos either failed to initiate the expression of these genes or downregulated their expression as development progressed. Genome editing reveals a role for OCT4 in human embryogenesis : Nature : Nature Research 2017-09-19T04:00:00Z These lineages need to be cultured in the lab dissimilarly, show different molecular characteristics and behave distinctly when they’re injected back into host blastocysts. New type of stem cell may make study of human embryos easier 2015-05-06T04:00:00Z It is the only such FDA–approved technology designed to analyze embryos and help fertility specialists select the embryo or embryos most likely to proceed to the blastocyst stage. New Test Lets Women Pick Their Best IVF Embryo 2015-04-16T04:00:00Z Embryos from overweight and obese women that reached the blastocyst stage did so an average of 17 hours faster than those from women with a healthy weight. Mom's Weight Might Influence Baby's Earliest Development 2014-11-14T05:00:00Z At the blastocyst stage, the scientists were able to derive stable embryonic stem cell lines; they were further able to differentiate these into various cell types, demonstrating viability for therapeutic use. The Stem Cell Front Broadens With The Success Of Therapeutic Cloning 2014-05-16T04:00:00Z This revealed that while cells from OCT4-targeted embryos were progressing towards the transcriptional state of the blastocyst, they were more dispersed and heterogeneous in their gene expression. Genome editing reveals a role for OCT4 in human embryogenesis : Nature : Nature Research 2017-09-19T04:00:00Z A human blastocyst, an early-stage embryo of the kind used in research, comprising 150 or so cells. Policy: Regulate embryos made for research 2014-04-30T17:20:33.448Z Hurlbut was able to generate pluripotent stem cells from the resulting organism, an inner cell mass very much like a blastocyst, but in essence incapable of truly forming a viable mouse embryo. Cloning Breakthrough Highlights An Alternative Source For Stem Cells 2013-05-29T14:38:37Z This faster early development means that these blastocysts contained fewer cells, most notably in the outermost layer, which goes on to form a large part of the placenta, the researchers said. Mom's Weight Might Influence Baby's Earliest Development 2014-11-14T05:00:00Z As expected, they wrote, somatic cell nuclei introduced into cytoplasts under these conditions developed into normal blastocysts. Viable Human Embryonic Stem Cells Created By Cloning 2013-05-17T12:47:40Z In the future, it would be informative to determine whether OCT4 mutation leads to changes in gene expression before the blastocyst stage, which may explain the failure of blastocyst development. Genome editing reveals a role for OCT4 in human embryogenesis : Nature : Nature Research 2017-09-19T04:00:00Z The technique is noninvasive and much less expensive than current genetic screening methods, which require removing a few cells from the blastocyst. ScienceShot: A Future Baby's Revealing First Photos 2013-05-16T22:00:00Z When it is at the “blastocyst” stage — about 100 cells — its core contains a small number of embryonic stem cells capable of becoming any type of cell possessed by the human body. Oregon scientists get stem cells from cloned human embryos 2013-05-16T02:12:00Z The blastocyst was "missing a few cell types that it would need to implant," as well as suffering other deficiencies, said Dr. Mitalipov. Human Cloning Moves a Step Closer 2013-05-15T19:16:27Z In 2001, President George W. Bush banned federal funding for research that would create more blastocysts, but stem cells already produced from them were fair game. Scientists create human stem cells through cloning 2013-05-15T16:09:22Z Coupled with the failure to maintain a fully expanded blastocyst, this finding suggests that the integrity of the trophectoderm may be compromised in OCT4-targeted embryos. Genome editing reveals a role for OCT4 in human embryogenesis : Nature : Nature Research 2017-09-19T04:00:00Z Mortality among blastocysts results in reduction to four embryos that implant. [Technical Response] Response to Comments on “Bateman in Nature: Predation on Offspring Reduces the Potential for Sexual Selection” 2013-05-02T17:56:04.117Z The blastocysts could be implanted in a woman’s uterus. Oregon scientists get stem cells from cloned human embryos 2013-05-16T02:12:00Z Researchers could scoop out the inner cell mass from the hybrid blastocyst, Loi suggests, and transplant it into an empty trophoblast derived from the same species as the surrogate mother. Will Cloning Ever Save Endangered Animals? 2013-03-11T11:15:00.737Z The first are embryonic stem cells, which are derived from the inner cell mass of a blastocyst, an early embryo. Researchers Home in on Biological Ways to Restore Hearing [Excerpt] 2013-02-15T11:15:03.257Z Alternatively, inducing POU5F1-null mutations in human embryos slightly later in development, following the onset of EGA, may bypass its earlier critical role and thereby delineate its function in the fully formed blastocyst. Genome editing reveals a role for OCT4 in human embryogenesis : Nature : Nature Research 2017-09-19T04:00:00Z For them, either a blastocyst, embryo or fetus has a right to life, no matter how it was conceived, or a woman doesn’t have the right to terminate a pregnancy, no matter the circumstances.” Rape exceptions aren’t legitimate 2012-08-20T18:03:00Z In one experiment, eight oocytes harvested from one woman produced five blastocysts and four embryonic stem cell lines — a success rate virtually unseen in other animals. Oregon scientists get stem cells from cloned human embryos 2013-05-16T02:12:00Z Incubate until the blastocyst convolutes itself then implant it in mother. Lifeboat 2012-07-25T17:21:01.303Z The derivation of hES cells requires a blastocyst, which after hES isolation cannot implant and give rise to an embryo anymore. Amniotic Fluid + Valproic Acid = New Source of Human Stem Cells 2012-07-03T16:15:04.193Z If the blastocysts were implanted into a uterus, the inner cell mass would become a fetus and the outer shell, or trophectoderm, would form accessory tissues such as the placenta. Stem Cells: Flexible friends 2012-02-29T18:21:27.080Z It then stopped growing, far short of the 100-cell blastocyst stage from which stem cells can be derived. Stem-cell research: Never say die 2012-01-11T18:20:33.987Z Finally, the researchers hit on a successful method, using early blastocysts that had split into no more than four separate cells. Baby Monkeys With 6 Genomes Are Scientific First 2012-01-07T00:15:00.240Z That's when the blastocyst, a tiny group of cells that will later become the foetus, embeds itself into the wall of the uterus. When does pregnancy begin? Doctors disagree 2011-11-17T19:23:44Z Advanced Cell Technology, based in Santa Monica California, is developing embryonic stem cell therapies for macular degeneration and other conditions using cells obtained non-destructively from an early embryo called a blastocyst. European Court Bans Patents Based on Embryonic Stem Cells 2011-10-18T22:15:09.500Z In this case, the parents offered their surplus blastocysts to science. Stem Cells: Flexible friends 2012-02-29T18:21:27.080Z The resulting hybrid was grown into a tiny embryo known as a blastocyst, implanted into the womb of a surrogate mother, and went on to become Dolly, the world’s most famous ewe. Stem cells: The nuclear option 2011-10-05T18:17:42Z They took individual cells out of these clumps and aggregated them back together, mixing and matching between three and six individuals to create 29 new blastocysts. Baby Monkeys With 6 Genomes Are Scientific First 2012-01-07T00:15:00.240Z The researchers then derived stem-cell lines from the blastocysts, a move that destroys the blastocyst. Cloning Offers Stem-Cell Hope 2011-10-05T23:57:52Z From those 13 blastocysts, the researchers were able to derive two stem cell lines. An Egg-Citing Recipe for Human Stem Cells 2011-10-05T18:00:00Z Early data from Fisher's lab — from studies funded by the California Institute of Regenerative Medicine — suggest that single-blastomere ES cells are even more malleable than those from blastocysts. Hidden toll of embryo ethics war 2011-03-16T18:20:34.137Z In this case, development proceeded apace, resulting in a blastocyst. Stem cells: The nuclear option 2011-10-05T18:17:42Z Only healthy blastocysts are implanted into the mother. Report supports embryo genetic tests in Germany 2011-01-19T00:45:00.257Z The problem, for some, is that stem-cell cultures derive ultimately from blastocysts, one of the earliest stages of embryonic development. Embryonic stem cells: Testing science 2010-12-09T10:31:00Z The Stanford researchers were able to determine with 93 percent accuracy which newly fertilized eggs would become blastocysts, and which would stop growing and die before they reached that stage. Study: Embryos' survival predicted 2010-10-05T01:02:00Z One or more blastocysts are implanted "fresh," and the rest are frozen for future attempted pregnancies. By freezing embryos, couples try to utilize fertility while delaying parenthood 2010-07-06T04:00:00Z Writing in the journal Nature, the team said 80 embryos were created and developed in the laboratory for six to eight days to reach the blastocyst stage, comprising a ball of around 100 cells. DNA egg swap offers route to disease-free babies 2010-04-14T17:15:00Z In preimplantation diagnosis, eggs are fertilized in vitro and allowed to develop for five or six days to the so-called blastocyst stage. Report supports embryo genetic tests in Germany 2011-01-19T00:45:00.257Z Extracting cells for culture destroys the blastocyst from which they are taken. Embryonic stem cells: Testing science 2010-12-09T10:31:00Z Next there was the question of storing our blastocyst embryos. By freezing embryos, couples try to utilize fertility while delaying parenthood 2010-07-06T04:00:00Z Our five frozen embryos, which we call our baby blastocysts, will remain in storage until we are ready to use them. By freezing embryos, couples try to utilize fertility while delaying parenthood 2010-07-06T04:00:00Z |
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