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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.
Anatomy of a T-cell. T-cells have many identical T-cell receptors that cover their surface and can only bind to one shape of antigen. When a T-cell receptor fits with its viral antigen on an infected cell, the Killer T-cell releases cytotoxins to kill that cell. The key to finding infected cells