在胚胎发育阶段，兴奋和抑制性神经元的适当比例确立以优化大脑功能。
During embryonic development, the proper ratio of excitatory and inhibitory neurons is established for optimal brain function.
目的探讨四倍体胚胎发育阶段对胚胎干细胞（ES）嵌合体小鼠制备的影响。
Objective To investigate the effects of developmental stages of tetraploid embryos on mouse chimeras from embryonic stem cells (ES).
同时，比较了饲养层细胞类型、生长因子、胚胎发育阶段等因素对绵羊胚胎干细胞分离培养效果的影响。
The effect of feeder cell type, growth factors, and embryo developmental stage on establishment of sheep embryonic stem cell was also studied in present experiment.
同时，比较了饲养层细胞类型、生长因子、胚胎发育阶段等因素对绵羊胚胎干细胞分离培养效果的影响。
The effect of feeder cell type, growth factors, and embryo developmental stage on establishment of sheep embryonic stem cell was also studied in present experiment.
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