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正常情况下,胚卵在输卵管中发育,而桑椹胚和囊胚发育的自然环境则在子宫腔。业已证明,这两个阶段胚胎生长需要的营养不同。体外受精(IVF)最初将 2 d分裂期胚卵
Under normal circumstances, the embryo eggs in the fallopian tube development, and morula and blastocyst development in the uterine cavity of the natural environment. It has been shown that the nutrients required for embryonic growth in these two stages are different. In vitro fertilization (IVF) will initially divide the embryo eggs by 2 days