英语词汇“gastrulation”造句的方法、技巧、例句及翻译-英语例句辞典

When the embryo begins to acquire shape in the process called gastrulation? Seven ways IVF changed the world – from Louise Brown to stem-cell research 2018-07-08T04:00:00Z

So one of the ways we are trying to use these systems is to model diseases that happen during gastrulation—in this case, ones associated with abnormalities of the spinal cord. Small Collections of Cells Determine How a Body Takes Its Shape 2023-11-09T05:00:00Z

Experts argue that extending the window for embryo research to 28 days would allow scientists to closely study vital developmental processes that occur during something called gastrulation - when the main tissue building blocks are established. Scientists: Allow forbidden 28-day embryo experiments 2023-10-24T04:00:00Z

In the early embryonic development of multicellular organisms, gastrulation plays a key role. Did animal evolution begin with a predatory lifestyle? 2023-09-29T04:00:00Z

At this point gastrulation begins and the so-called germ layers form. Career choice in stem cells: Predetermined or self-selected? 2023-09-19T04:00:00Z

She says she’s particularly eager to see these models developed through a phase called gastrulation, which occurs about three weeks into human development. Scientists Create Human Embryo-like Structures with Stem Cells 2023-06-16T04:00:00Z

Recall that these germ layers are formed during gastrulation, and that they are predetermined to develop into the animal’s specialized tissues and organs. Fundamentals of Biology 2015-01-01T00:00:00Z

The blastula, which in some species is a hollow ball of cells, undergoes a process called gastrulation, during which the three germ layers form. Concepts of Biology 2013-04-25T00:00:00Z

They developed further than any previous blastoids, undergoing gastrulation, the cellular reorganization that sets up the three basic layers of the embryo. First mock monkey embryos may shine light on pregnancy milestones 2023-04-06T04:00:00Z

After gastrulation, the embryo can be thought of as an onion with three layers: the ectoderm, the mesoderm and the endoderm. Career choice in stem cells: Predetermined or self-selected? 2023-09-19T04:00:00Z

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

Upon gastrulation, part of the ball of cells invaginates, forming a cavity called a blastopore. Fundamentals of Biology 2015-01-01T00:00:00Z

During gastrulation, the blastula folds upon itself to form the three layers of cells. Biology for AP Courses 2022-06-09T00:00:00Z

“It’s during gastrulation that the different cells emerge, but they also start to be positioned in different places in forming the body so that they can carry out their functions and form the correct organs.” New research offers glimpse into early human development 2021-11-17T05:00:00Z

The second plausible stage is called gastrulation, which happens about two weeks after fertilization. When human life begins is a question of politics — not biology 2021-09-07T04:00:00Z

The blueprint of an organism arises through a process known as “gastrulation”, which in humans begins around two weeks into development. Scientists create embryo-like research model from human stem cells 2020-06-10T04:00:00Z

The blastopore is the indentation formed during the initial stages of gastrulation. Fundamentals of Biology 2015-01-01T00:00:00Z

The blastula, which in some species is a hollow ball of cells, undergoes a process called gastrulation, in which the three germ layers form. Biology for AP Courses 2022-06-09T00:00:00Z

It’s very common for embryos to fail during gastrulation or shortly afterwards, he said. New research offers glimpse into early human development 2021-11-17T05:00:00Z

In gastrulation, the epiblast differentiates into the three germ layers of cells — the ectoderm, mesoderm and endoderm — that will form the fetus. Human embryo implantation modelled in microfluidic channels 2019-09-10T04:00:00Z

A process called gastrulation, during which the body plan is established, occurs in these regions. Debate ethics of embryo models from stem cells 2018-12-11T05:00:00Z

Several key events happen in the third week, during a process called gastrulation. The labs growing human embryos for longer than ever before 2018-07-03T04:00:00Z

“Currently, the widely accepted limit for human embryo culture is 14 days or in other words immediately prior to gastrulation” said Zernicka-Goetz. 3D embryo atlas reveals human development in unprecedented detail 2016-11-24T05:00:00Z

For all its importance, no one has actually witnessed gastrulation in a human embryo. Inside the ‘black box’ of human development 2016-06-05T04:00:00Z

The mouse embryos survived past gastrulation — the stage at which they form layers of cells that will become organs3. Human embryos grown in lab for longer than ever before 2016-05-03T04:00:00Z

A human pluripotent stem-cell colony that mimics the initiation of gastrulation in the embryo, when three different cell layers appear.Credit: Debate ethics of embryo models from stem cells 2018-12-11T05:00:00Z

After about 24 hours, a hole opened up and, subsequently, cells began to flatten on one side and elongate on the other, characteristic of the process leading up to gastrulation. The labs growing human embryos for longer than ever before 2018-07-03T04:00:00Z

That process is called gastrulation, and it is enormously significant in the embryo’s growth, the beginning of a crucial distinction between what’s inside and what’s outside. Birth? Trivial Next to Cellular Doughnut-Making Process 2015-05-04T04:00:00Z

In reality, the pressing need is to see and understand gastrulation, which can only be done by extending the 14-day limit by a week or two, he says. Inside the ‘black box’ of human development 2016-06-05T04:00:00Z

The US government introduced the limit in 1979, on the basis that 14 days marks the beginning of gastrulation in humans. Human embryos grown in lab for longer than ever before 2016-05-03T04:00:00Z

At the beginning of an organism’s development, the embryo undergoes a process called gastrulation. The man who grew eyes 2014-08-26T04:00:00Z

One of these signals, Toddler, is a short, conserved, and secreted peptide that promotes the movement of cells during zebrafish gastrulation. [Research Article] Toddler: An Embryonic Signal That Promotes Cell Movement via Apelin Receptors 2014-02-13T19:25:43.098Z

Even when they are embryos, their cells not only change shape during gastrulation but move around and turn into different kinds of tissues. Birth? Trivial Next to Cellular Doughnut-Making Process 2015-05-04T04:00:00Z

It is not birth, marriage or death, but gastrulation that is truly the most important time in your life.” Inside the ‘black box’ of human development 2016-06-05T04:00:00Z

It, as well as the process of gastrulation, agrees in its main features with the same phenomenon in Amia, Dipnoans and Urodele amphibians. Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 8 "Cube" to "Daguerre, Louis" 2012-01-31T03:00:17.257Z

As an attempt to explain gastrulation, the origin of the germinal layers and many other events of development, the doctrine of determinants has reversed cause and effect. The Biological Problem of To-day Preformation Or Epigenesis? The Basis of a Theory of Organic Development 2011-08-29T02:01:04.170Z

Both the local and ubiquitous expression of Toddler were able to rescue gastrulation movements in toddler mutants, suggesting that Toddler acts as a motogen, a signal that promotes cell migration. [Research Article] Toddler: An Embryonic Signal That Promotes Cell Movement via Apelin Receptors 2014-02-13T19:25:43.098Z

It is desirable only further to explain that gastrulation does not take place in all the Metazoa after exactly the same plan. Darwin, and After Darwin (Vol. 1 and 3, of 3) An Exposition of the Darwinian Theory and a Discussion of Post-Darwinian Questions

By allowing some of these spare IVF embryos to reach gastrulation, scientists would be able to understand some of the most important events in early human development. Inside the ‘black box’ of human development 2016-06-05T04:00:00Z

It is to the influence of the different amounts of yolk present in the egg that are due the great differences in the segmentation and gastrulation processes, which almost mask their true significance. Form and Function A Contribution to the History of Animal Morphology

Placentals, the. characters of the. gastrulation of the. The Evolution of Man — Volume 2

Both loss and overproduction of Toddler reduce cell movement, revealing that Toddler levels need to be tightly regulated during gastrulation. [Research Article] Toddler: An Embryonic Signal That Promotes Cell Movement via Apelin Receptors 2014-02-13T19:25:43.098Z

The remarkable processes of gastrulation, ovum-segmentation, and formation of germinal layers present a most conspicuous variety. The Evolution of Man — Volume 1

We have, up to the present, only considered that form of segmentation and gastrulation which, for many and weighty reasons, we may regard as the original, primordial, or palingenetic form. The Evolution of Man — Volume 1

We have only recently succeeded, by means of comparative research, in overcoming these difficulties, and reducing this cenogenetic form of gastrulation to the original palingenetic type. The Evolution of Man — Volume 1

As the gastrulation proceeds a large spherical blastula is formed from this peculiar solid amphigastrula of the placental, as we saw in the case of the marsupial. The Evolution of Man — Volume 1

The cenogenetic gastrulation of the placental has been greatly modified by secondary adaptation in the various groups of this most advanced and youngest sub-class of the mammals. The Evolution of Man — Volume 1

I regard all those that diverge from the primary palingenetic gastrulation as secondary, modified, and cenogenetic. The Evolution of Man — Volume 1

We give the name of the gastrula to the important embryonic form that has these primitive organs, and the name of gastrulation to the formation of it. The Evolution of Man — Volume 1

The gastrulation of the discoblastic ova, which chiefly concerns us, offers serious difficulties to microscopic investigation and philosophic consideration. The Evolution of Man — Volume 1

It must, therefore, be our next task to make a comparative study of the various forms of vertebrate gastrulation, and trace them backwards to that of the lancelet. The Evolution of Man — Volume 1

But as man also belongs to this sub-class, and as his as yet unstudied gastrulation cannot be materially different from that of the other placentals, it merits the closest attention. The Evolution of Man — Volume 1

As the gastrulation of the amphioxus shows the original palingenetic form in its simplest features, that of the other vertebrates must have been derived from it. The Evolution of Man — Volume 1

Thus the gastrulation of the placentals, which diverges most from that of the amphioxus, the primitive form, is reduced to the original type, the invagination of a modified blastula. The Evolution of Man — Volume 1

This proves the essential unity of gastrulation in all the vertebrates, in spite of the striking differences in the various classes. The Evolution of Man — Volume 1

In order to complete our consideration of the important processes of segmentation and gastrulation, we will, in conclusion, cast a brief glance at the fourth chief type—superficial segmentation. The Evolution of Man — Volume 1

The germinal disk of the hen's ovum at the beginning of gastrulation; A before incubation, B in the first hour of incubation. The Evolution of Man — Volume 1

Its nutritive yelk is much smaller and its formative yelk less obscured with black pigment-cells than in the case of the frog; and its gastrulation has better retained the original palingenetic character. The Evolution of Man — Volume 1

The gastrulation of the mammals must be derived from this special embryonic development of the reptiles and birds. The Evolution of Man — Volume 1

When the blastula is fully formed, we have again in this case the important folding or invagination that determines gastrulation. The Evolution of Man — Volume 1

The reader will find a scheme of these different kinds of segmentation and gastrulation at the close of this chapter. The Evolution of Man — Volume 1

By far the most important process that determines the various cenogenetic forms of gastrulation is the change in the nutrition of the ovum and the accumulation in it of nutritive yelk. The Evolution of Man — Volume 1

As this theory, a logical conclusion from the gastraea theory, has been fully substantiated by the comparative study of gastrulation in the last few decades, we must exactly reverse the hitherto prevalent mode of treatment. The Evolution of Man — Volume 1

In order to understand them properly, we must first consider the various modifications of gastrulation in these classes. The Evolution of Man — Volume 1

This was to be expected, as the characteristic gastrulation of the mammal has descended from that of the reptiles. The Evolution of Man — Volume 1

This is particularly interesting in connection with our subject, because the few remaining survivors of this division, which was so numerous in paleozoic times, exhibit three different types of gastrulation. The Evolution of Man — Volume 1

Meantime we realise that gastrulation may be reduced to one and the same process in all the vertebrates. The Evolution of Man — Volume 1

It is only by the historical and comparative study of these that we can understand the difficult and obscure gastrulation of the amniotes. The Evolution of Man — Volume 1

In these the gastrulation proceeds in two phases, as Semon rightly observes: firstly, formation of the entoderm by cleavage at the centre and further growth at the edge; secondly, invagination. The Evolution of Man — Volume 1

Both the segmentation of the ovum and the subsequent gastrulation have in this way been considerably changed. The Evolution of Man — Volume 1

Hence the distinctive embryonic process of the mammal must have arisen by cenogenetic modifications from the older form of gastrulation of the reptiles and birds. The Evolution of Man — Volume 1

Thus it was no light task to trace the identity of this process of gastrulation in all the animals. The Evolution of Man — Volume 1

Only the latter exhibit the important processes of segmentation and gastrulation; and they alone have a primitive gut, and form germinal layers and tissues. The Evolution of Man — Volume 1

单词	gastrulation
例句	gastrulation When the embryo begins to acquire shape in the process called gastrulation? Seven ways IVF changed the world – from Louise Brown to stem-cell research 2018-07-08T04:00:00Z So one of the ways we are trying to use these systems is to model diseases that happen during gastrulation—in this case, ones associated with abnormalities of the spinal cord. Small Collections of Cells Determine How a Body Takes Its Shape 2023-11-09T05:00:00Z Experts argue that extending the window for embryo research to 28 days would allow scientists to closely study vital developmental processes that occur during something called gastrulation - when the main tissue building blocks are established. Scientists: Allow forbidden 28-day embryo experiments 2023-10-24T04:00:00Z In the early embryonic development of multicellular organisms, gastrulation plays a key role. Did animal evolution begin with a predatory lifestyle? 2023-09-29T04:00:00Z At this point gastrulation begins and the so-called germ layers form. Career choice in stem cells: Predetermined or self-selected? 2023-09-19T04:00:00Z She says she’s particularly eager to see these models developed through a phase called gastrulation, which occurs about three weeks into human development. Scientists Create Human Embryo-like Structures with Stem Cells 2023-06-16T04:00:00Z Recall that these germ layers are formed during gastrulation, and that they are predetermined to develop into the animal’s specialized tissues and organs. Fundamentals of Biology 2015-01-01T00:00:00Z The blastula, which in some species is a hollow ball of cells, undergoes a process called gastrulation, during which the three germ layers form. Concepts of Biology 2013-04-25T00:00:00Z They developed further than any previous blastoids, undergoing gastrulation, the cellular reorganization that sets up the three basic layers of the embryo. First mock monkey embryos may shine light on pregnancy milestones 2023-04-06T04:00:00Z After gastrulation, the embryo can be thought of as an onion with three layers: the ectoderm, the mesoderm and the endoderm. Career choice in stem cells: Predetermined or self-selected? 2023-09-19T04:00:00Z 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 Upon gastrulation, part of the ball of cells invaginates, forming a cavity called a blastopore. Fundamentals of Biology 2015-01-01T00:00:00Z During gastrulation, the blastula folds upon itself to form the three layers of cells. Biology for AP Courses 2022-06-09T00:00:00Z “It’s during gastrulation that the different cells emerge, but they also start to be positioned in different places in forming the body so that they can carry out their functions and form the correct organs.” New research offers glimpse into early human development 2021-11-17T05:00:00Z The second plausible stage is called gastrulation, which happens about two weeks after fertilization. When human life begins is a question of politics — not biology 2021-09-07T04:00:00Z The blueprint of an organism arises through a process known as “gastrulation”, which in humans begins around two weeks into development. Scientists create embryo-like research model from human stem cells 2020-06-10T04:00:00Z The blastopore is the indentation formed during the initial stages of gastrulation. Fundamentals of Biology 2015-01-01T00:00:00Z The blastula, which in some species is a hollow ball of cells, undergoes a process called gastrulation, in which the three germ layers form. Biology for AP Courses 2022-06-09T00:00:00Z It’s very common for embryos to fail during gastrulation or shortly afterwards, he said. New research offers glimpse into early human development 2021-11-17T05:00:00Z In gastrulation, the epiblast differentiates into the three germ layers of cells — the ectoderm, mesoderm and endoderm — that will form the fetus. Human embryo implantation modelled in microfluidic channels 2019-09-10T04:00:00Z A process called gastrulation, during which the body plan is established, occurs in these regions. Debate ethics of embryo models from stem cells 2018-12-11T05:00:00Z Several key events happen in the third week, during a process called gastrulation. The labs growing human embryos for longer than ever before 2018-07-03T04:00:00Z “Currently, the widely accepted limit for human embryo culture is 14 days or in other words immediately prior to gastrulation” said Zernicka-Goetz. 3D embryo atlas reveals human development in unprecedented detail 2016-11-24T05:00:00Z For all its importance, no one has actually witnessed gastrulation in a human embryo. Inside the ‘black box’ of human development 2016-06-05T04:00:00Z The mouse embryos survived past gastrulation — the stage at which they form layers of cells that will become organs3. Human embryos grown in lab for longer than ever before 2016-05-03T04:00:00Z A human pluripotent stem-cell colony that mimics the initiation of gastrulation in the embryo, when three different cell layers appear.Credit: Debate ethics of embryo models from stem cells 2018-12-11T05:00:00Z After about 24 hours, a hole opened up and, subsequently, cells began to flatten on one side and elongate on the other, characteristic of the process leading up to gastrulation. The labs growing human embryos for longer than ever before 2018-07-03T04:00:00Z That process is called gastrulation, and it is enormously significant in the embryo’s growth, the beginning of a crucial distinction between what’s inside and what’s outside. Birth? Trivial Next to Cellular Doughnut-Making Process 2015-05-04T04:00:00Z In reality, the pressing need is to see and understand gastrulation, which can only be done by extending the 14-day limit by a week or two, he says. Inside the ‘black box’ of human development 2016-06-05T04:00:00Z The US government introduced the limit in 1979, on the basis that 14 days marks the beginning of gastrulation in humans. Human embryos grown in lab for longer than ever before 2016-05-03T04:00:00Z At the beginning of an organism’s development, the embryo undergoes a process called gastrulation. The man who grew eyes 2014-08-26T04:00:00Z One of these signals, Toddler, is a short, conserved, and secreted peptide that promotes the movement of cells during zebrafish gastrulation. [Research Article] Toddler: An Embryonic Signal That Promotes Cell Movement via Apelin Receptors 2014-02-13T19:25:43.098Z Even when they are embryos, their cells not only change shape during gastrulation but move around and turn into different kinds of tissues. Birth? Trivial Next to Cellular Doughnut-Making Process 2015-05-04T04:00:00Z It is not birth, marriage or death, but gastrulation that is truly the most important time in your life.” Inside the ‘black box’ of human development 2016-06-05T04:00:00Z It, as well as the process of gastrulation, agrees in its main features with the same phenomenon in Amia, Dipnoans and Urodele amphibians. Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 8 "Cube" to "Daguerre, Louis" 2012-01-31T03:00:17.257Z As an attempt to explain gastrulation, the origin of the germinal layers and many other events of development, the doctrine of determinants has reversed cause and effect. The Biological Problem of To-day Preformation Or Epigenesis? The Basis of a Theory of Organic Development 2011-08-29T02:01:04.170Z Both the local and ubiquitous expression of Toddler were able to rescue gastrulation movements in toddler mutants, suggesting that Toddler acts as a motogen, a signal that promotes cell migration. [Research Article] Toddler: An Embryonic Signal That Promotes Cell Movement via Apelin Receptors 2014-02-13T19:25:43.098Z It is desirable only further to explain that gastrulation does not take place in all the Metazoa after exactly the same plan. Darwin, and After Darwin (Vol. 1 and 3, of 3) An Exposition of the Darwinian Theory and a Discussion of Post-Darwinian Questions By allowing some of these spare IVF embryos to reach gastrulation, scientists would be able to understand some of the most important events in early human development. Inside the ‘black box’ of human development 2016-06-05T04:00:00Z It is to the influence of the different amounts of yolk present in the egg that are due the great differences in the segmentation and gastrulation processes, which almost mask their true significance. Form and Function A Contribution to the History of Animal Morphology Placentals, the. characters of the. gastrulation of the. The Evolution of Man — Volume 2 Both loss and overproduction of Toddler reduce cell movement, revealing that Toddler levels need to be tightly regulated during gastrulation. [Research Article] Toddler: An Embryonic Signal That Promotes Cell Movement via Apelin Receptors 2014-02-13T19:25:43.098Z The remarkable processes of gastrulation, ovum-segmentation, and formation of germinal layers present a most conspicuous variety. The Evolution of Man — Volume 1 We have, up to the present, only considered that form of segmentation and gastrulation which, for many and weighty reasons, we may regard as the original, primordial, or palingenetic form. The Evolution of Man — Volume 1 We have only recently succeeded, by means of comparative research, in overcoming these difficulties, and reducing this cenogenetic form of gastrulation to the original palingenetic type. The Evolution of Man — Volume 1 As the gastrulation proceeds a large spherical blastula is formed from this peculiar solid amphigastrula of the placental, as we saw in the case of the marsupial. The Evolution of Man — Volume 1 The cenogenetic gastrulation of the placental has been greatly modified by secondary adaptation in the various groups of this most advanced and youngest sub-class of the mammals. The Evolution of Man — Volume 1 I regard all those that diverge from the primary palingenetic gastrulation as secondary, modified, and cenogenetic. The Evolution of Man — Volume 1 We give the name of the gastrula to the important embryonic form that has these primitive organs, and the name of gastrulation to the formation of it. The Evolution of Man — Volume 1 The gastrulation of the discoblastic ova, which chiefly concerns us, offers serious difficulties to microscopic investigation and philosophic consideration. The Evolution of Man — Volume 1 It must, therefore, be our next task to make a comparative study of the various forms of vertebrate gastrulation, and trace them backwards to that of the lancelet. The Evolution of Man — Volume 1 But as man also belongs to this sub-class, and as his as yet unstudied gastrulation cannot be materially different from that of the other placentals, it merits the closest attention. The Evolution of Man — Volume 1 As the gastrulation of the amphioxus shows the original palingenetic form in its simplest features, that of the other vertebrates must have been derived from it. The Evolution of Man — Volume 1 Thus the gastrulation of the placentals, which diverges most from that of the amphioxus, the primitive form, is reduced to the original type, the invagination of a modified blastula. The Evolution of Man — Volume 1 This proves the essential unity of gastrulation in all the vertebrates, in spite of the striking differences in the various classes. The Evolution of Man — Volume 1 In order to complete our consideration of the important processes of segmentation and gastrulation, we will, in conclusion, cast a brief glance at the fourth chief type—superficial segmentation. The Evolution of Man — Volume 1 The germinal disk of the hen's ovum at the beginning of gastrulation; A before incubation, B in the first hour of incubation. The Evolution of Man — Volume 1 Its nutritive yelk is much smaller and its formative yelk less obscured with black pigment-cells than in the case of the frog; and its gastrulation has better retained the original palingenetic character. The Evolution of Man — Volume 1 The gastrulation of the mammals must be derived from this special embryonic development of the reptiles and birds. The Evolution of Man — Volume 1 When the blastula is fully formed, we have again in this case the important folding or invagination that determines gastrulation. The Evolution of Man — Volume 1 The reader will find a scheme of these different kinds of segmentation and gastrulation at the close of this chapter. The Evolution of Man — Volume 1 By far the most important process that determines the various cenogenetic forms of gastrulation is the change in the nutrition of the ovum and the accumulation in it of nutritive yelk. The Evolution of Man — Volume 1 As this theory, a logical conclusion from the gastraea theory, has been fully substantiated by the comparative study of gastrulation in the last few decades, we must exactly reverse the hitherto prevalent mode of treatment. The Evolution of Man — Volume 1 In order to understand them properly, we must first consider the various modifications of gastrulation in these classes. The Evolution of Man — Volume 1 This was to be expected, as the characteristic gastrulation of the mammal has descended from that of the reptiles. The Evolution of Man — Volume 1 This is particularly interesting in connection with our subject, because the few remaining survivors of this division, which was so numerous in paleozoic times, exhibit three different types of gastrulation. The Evolution of Man — Volume 1 Meantime we realise that gastrulation may be reduced to one and the same process in all the vertebrates. The Evolution of Man — Volume 1 It is only by the historical and comparative study of these that we can understand the difficult and obscure gastrulation of the amniotes. The Evolution of Man — Volume 1 In these the gastrulation proceeds in two phases, as Semon rightly observes: firstly, formation of the entoderm by cleavage at the centre and further growth at the edge; secondly, invagination. The Evolution of Man — Volume 1 Both the segmentation of the ovum and the subsequent gastrulation have in this way been considerably changed. The Evolution of Man — Volume 1 Hence the distinctive embryonic process of the mammal must have arisen by cenogenetic modifications from the older form of gastrulation of the reptiles and birds. The Evolution of Man — Volume 1 Thus it was no light task to trace the identity of this process of gastrulation in all the animals. The Evolution of Man — Volume 1 Only the latter exhibit the important processes of segmentation and gastrulation; and they alone have a primitive gut, and form germinal layers and tissues. The Evolution of Man — Volume 1
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