This is especially important for research of the early period of embryonic development.

这对于胚胎发育早期的研究尤为重要。

Blastoids and gastruloids mimicking earlier stages of embryonic development have been grown in the past.

过去曾培育出模仿胚胎发育早期阶段的类胚细胞和类原肠胚。

So, when the nucleus is removed to make room for the new DNA, those spindle proteins are removed too, making embryonic development that much harder.

因此，当细胞核被移除为新 DNA 腾出空间时， 那些纺锤体蛋白也会被移除，从而使胚胎发育变得更加困难。