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Noun. 1. cytotoxic T cell-T cell with CD8 receptor that recognizes antigens on the surface of a virus-infected cell and binds to the infected cell and kill it. CD8 cell, CD8 T cell, killer cell, killer T cell. T cell, T lymphocyte-a small lymphocyte developed in the thymus; it orchestrates the immune system's response to infected or malignant cells.
Art Connections. 1  Helper T cells release cytokines while cytotoxic T cells kill the infected cell. 2  Helper T cells are CD4+, while cytotoxic T cells are CD8+. 3  MHC II is a receptor found on most body cells, while MHC I is a receptor found on immune cells only. 4  The T cell receptor is found on both CD4+ and CD8+ T cells.