卵裂核 cleavage nucleus 多细胞动物，通过受精，雌雄的生殖细胞核结合所成的合子核（母核），或由其分裂而形成的分裂球的核，称为卵裂核。一般，来自父、母的染色体在卵裂核内融合，经过核分裂均等地分配在子核内，但有时候（剑水蚤类），父、母的染色体组不结合而分别进行有丝分裂。
目的探讨卵细胞第一极体形态与原核期受精卵形态、卵裂期胚胎质量的关系。
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.
用离子霉素或乙醇预激活去核卵母细胞，对重组胚的卵裂和发育无明显影响。
Preactivating donor cells and enucleated oocytes with ionomycin has no significant enhancive effect on the cleavage of constructed embryos, but it arrests the blastocyst development.
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