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文献和实验磷脂酰丝氨酸(Phosphatidylserine, PS)正常位于细胞膜的内侧,但在细胞凋亡的早期,PS可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(图3)。Annexin-V是一种分子量为35~36KD的Ca2+依赖性磷脂结合蛋白,能与PS高亲和力特异性结合。将Annexin-V进行荧光素(FITC、PE)或biotin标记,以标记了的Annexin-V作为荧光探针,利用流式细胞仪或荧光显微镜可检测细胞凋亡的发生。碘化丙啶(propidine iodide, PI)是一种核酸
The Avidin-Biotin Complex (ABC) Method and Other Avidin-Biotin Binding Methods
These methods involve, at their core, the vitamin biotin and the protein avidin, which bind together irreversibly. By establishing a biotin link, through avidin, between the horseradish peroxidase enzyme and a secondary antibody reagent
The Avidin-Biotin Complex(ABC) Method
, between the horseradish peroxidase enzyme and a secondary antibody reagent, enzyme localization can be achieved at the site of primary antibody interaction with the specimen (see ) Fig. 1 ). The biotin molecule is small and can be easily conjugated to immunoglobulin
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