答 :　在凋亡的早期阶段 ,胞浆膜磷脂的不对称性丧失 ,导致膜内侧磷脂酰丝氨酸 (PS)从细胞膜内层暴露于外层 ,从而可被PS特异的Annexin V探针所标记。PS转移到细胞膜外不是细胞凋亡特有的 ,也可发生在细胞坏死中。但在凋亡的早期细胞膜是完整的 ,而细胞坏死时细胞膜的完整性被 A: In the early stages of apoptosis, loss of asymmetry in cytoplasmic membrane phospholipids results in the inner membrane phosphatidylserine (PS) being exposed to the outer layer from the inner membrane of the cell membrane and thus can be labeled with PS-specific Annexin V probes. PS is not transferred to the outside of the cell membrane is not unique to apoptosis, can also occur in cell necrosis. However, in the early stages of apoptosis, the cell membrane is intact, while the integrity of the cell membrane when the cells are necrotic