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Medical Definition of Lyt antigen
1. A set of plasmalemmal surface glycoproteins on mouse T lymphocytes. Possession of Lyt 1 partly defines a T helper cell and of Lyt 2, 3 suppressor and cytotoxic cells. Formerly known as Ly antigens. See: Lyb antigen. This entry appears with permission from the Dictionary of Cell and Molecular Biology (11 Mar 2008)