淋巴细胞与免疫功能十分密切。目前淋巴细胞已可区分成若于亚群(Subpopulations),在形态上,即使在电子显徽镜下亦无法区别它们。但在功能上已明确有几种不同的类别(Subsets),每一类淋巴细胞的细胞膜表面都有免疫学的标记,即不同的抗原簇。 Lymphocytes and immune function are very close. Currently, lymphocytes have been differentiated into subpopulations, and morphologically, they can not be differentiated even under the electron microscope. However, several distinct subsets have been clearly defined in function. Each type of lymphocyte has an immunologically labeled cell membrane surface, ie, different antigenic clusters.