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收藏CD8 T cell surface antigen is heterodimer of an alpha and a beta chain linked by two disulfide
bonds .It belongs type I membrane protein. Selectively expressing of CD8 on a subset of T cells
leads to CD8 T cell development. Through identifying cytotoxic/suppressor T-cells that interact
with MHC class I bearing targets, CD8 is thought to play a role in the process of T-cell mediated
killing. Veillette et al (1988) found the CD8 is associated with the internal membrane tyrosine-
protein kinase p56lck.