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The Ly and Ia phenotypes of T lymphocytes involved in different functions were characterized by the use of specific antisera. T cells responsible for delayed-type hypersensitivity (DTH) and for helper functions were found to be Ly-1+,2- in contrast to cytotoxic T cells and T cells responsible for suppression of antibody responses which were Ly-1-,2+. Unlike some primed helper cells, T cells involved in DTH were Ia-. Suppressor cells in the system were Ia+.

Ly and Ia antigen phenotypes of T cells involved in delayed-type hypersensitivity and in suppression.