T细胞是由功能不同的异质性淋巴细胞组成。成熟的T细胞均属小淋巴细胞, 在形态学上不能区分。但在T细胞发育不同阶段以及成熟T细胞在静止期和活化期, 细胞膜分子表达的种类和数量均不相同。这些分子与T细胞对抗原的识别、细胞的活化、信息的传递、细胞的增殖和分化以及T细 T cells are composed of heterogeneous lymphocytes of different functions. Mature T cells are small lymphocytes, morphologically indistinguishable. However, in different stages of T cell development and mature T cells in quiescent and activated phase, the type and number of cell membrane molecules are not the same. Identification of these molecules and T cells for antigens, activation of cells, transmission of information, proliferation and differentiation of cells, and T-fine