The ensuing gene expression profile in the cleavage-stage embryo establishes totipotency and is required for further development.
随后卵裂时期胚胎的基因表达模式将建立一种全能性，这对进一步发育是必需的。
2
Objective To investigate the relationship between the first polar body morphology of oocyte and the zygote morphology in pronucleus stage, embryo quality in cleavage stage.