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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.
The thymus, a specialized organ of the immune system, is primarily responsible for the T cellâs maturation. There are six types of T-cells, namely: Helper T-cells, Cytotoxic T-cells, Memory T-cells, Regulatory T-cells, Natural Killer T-cells (NKT) and Gamma Delta T-cells. B-cells, on the other hand, play a principal role in humoral immunity (with antibody involvement).