Methods: Culture the mouse blastocysts on day 4 of pregnancy on human amniotic basement membrane and observe microscopically.
方法：将妊娠第四天的小鼠囊胚培养在人羊膜的基膜面，并作病理观察。
Methods: Culture the mouse blastocysts on day 4 of pregnancy on human amniotic basement membrane and observe microscopically.
方法：将妊娠第四天的小鼠囊胚培养在人羊膜的基膜面，并作病理观察。
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