Annexin V-YSFluorTM 488/PI细胞凋亡检测试剂盒（Annexin V-YSFluorTM 488/PI Apoptosis Detection Kit）是用YSFluorTM 488标记了的Annexin V作为探针，来检测细胞早期凋亡的发生，可用流式细胞仪或其他荧光检测设备进行检测。
其检测原理为：在正常的活细胞中，磷脂酰丝氨酸（phosphotidylserine，PS）位于细胞膜的内侧，但在早期凋亡的细胞中，PS 从细胞膜的内侧翻转到细胞膜的表面，暴露在细胞外环境中。Annexin-Ⅴ（膜联蛋白-V）是一种分子量为35-36KD的Ca2+ 依赖性磷脂结合蛋白，能与PS高亲和力结合。可通过细胞外侧暴露的磷脂酰丝氨酸与凋亡早期细胞的胞膜结合。
另外，本试剂盒中还提供了碘化丙啶（Propidium Iodide，PI）用来区分存活的早期细胞和坏死或晚期凋亡细胞。PI是一种核酸染料，它不能透过正常细胞或早期凋亡细胞的完整的细胞膜，但可以透过凋亡晚期和坏死细胞的细胞膜而使细胞核染红。因此，将Annexin V与PI联合使用时，PI 则被排除在活细胞（Annexin V-/PI-）和早期凋亡细胞（Annexin V+/PI-）之外，而晚期凋亡细胞和坏死细胞同时被YSFluorTM 488 和PI 结合染色呈现双阳性（Annexin V+/PI+）。
操作便捷，准确
冰袋（wet ice）运输。-20 ℃避光长期保存，避免反复冻融，一年有效。
【注】：如果需要在短时间内多次重复使用，可以在 4 ℃避光保存，半年有效。
Q:Annexin V 和JC-1、Tunel 细胞凋亡检测的区别？
A: Annexin V 是检测细胞早期凋亡的试剂，JC-1 是检测细胞中期凋亡的试剂、Tunel 是检测细胞晚期凋亡的试剂。
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