Abstract
Abstract A series of monoclonal antibodies, prepared against the Burkitt's lymphoma line Daudi, define antigens predominantly expressed on cells of the B lymphoid series. Four antibodies which react with HLA-DR or DR-like antigens have enabled the serological definition of at least two and possibly three distinct subsets of molecules. Of these four antibodies, one (DA6.164) defines a DR allotype associated epitope common to all DR types tested except DR 7 homozygotes. A second (DA6.147) recognizes a DR-like antigen which is expressed in abundance on B lymphoblastoid cells, weakly on peripheral blood B cells and not at all on activated T cells. Two further antibodies (DA6.231 and DA6.121), with indistinguishable specificity, detect an epitope apparently common to more than one set of DR molecules.
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