Blood cells (including planet血小板 , vascular endothelium cells血管内皮细胞)differentiate to different lines —Different differentiation phase不同分化阶段 —Process in cell activation,细胞活化过程
appear or disappear cell membrane molecules.细胞膜分子的出现或消失
CD (cluster of differentiation):分化群
recognize same antigen, antibodies from various lab.