单词	T lymphocyte
释义	T lymphocyte noun : any of several lymphocytes (such as a helper T cell) that differentiate in the thymus, possess highly specific cell-surface antigen receptors, and include some that control the initiation or suppression of cell-mediated and humoral immunity (as by the regulation of T and B cell maturation and proliferation) and others that lyse antigen-bearing cells : t cell T lymphocytes differentiate in the thymus and interact directly with other cells to regulate the immune response or to kill cells expressing the appropriate antigen. Alan F. Williams Activation of a T lymphocyte requires occupancy of its antigen-specific cell surface receptor … by its appropriate ligand (processed antigen presented by class I or class II MHC molecules) and a second signal from a growth factor. Suryaprakash R. Sambhara et al. compare b lymphocyte Word History Etymology thymus-derived First Known Use 1972, in the meaning defined above Medical Definition T lymphocyte noun ˈtē-  : t cell
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