Objective: To observe apoptosis in ICM and TE induced by all-trans retinoic acid(ATRA)in mouse blastocysts in vitro.

• 目的:探讨全反式维生素A酸(ATRA)对体外培养小鼠囊胚中内细胞群(ICM)和滋养层(TE)细胞凋亡的影响。