引言我们生命的起点，始于精子与卵子结合形成受精卵（zygote），随后在短短几天内经历一系列精密调控的分裂与分化，最终发展成具有多种细胞类型的囊胚（blastocyst），为胚胎成功植入子宫做好准备。然而，即便在最理想的生殖条件下，仍有大量受精卵无法 ...

During the peer-review process the editor and reviewers write an eLife assessment that summarises the significance of the findings reported in the article (on a scale ranging from landmark to useful) ...