Abstract
We obtained a monoclonal antibody, A50, after immunizing Biozzi's high responder strain of mice with T cell chronic lymphocytic leukemia (T- CLL) cells. A50 recognized an antigen present on the surface of B cell chronic lymphocytic leukemia cells from many patients and from cells of T lineage from any subject we tested. We could not find this antigen either on the surface of normal B cell or on other non-T cell malignancies. On T cells, this antigen was present on a subpopulation of thymus cells, and on most peripheral T cells. The antigen was present on the surface of cells from T-CLL, Sezary's disease, and a subset o T cell lymphoma. The antigen seemed to belong to a complex set of antigenic determinants that we had defined with rabbit antisera.
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