✍ Scribed by Dr. Anne-Marie Lebacq-Verheyden; Anne-Marie Ravoet; Hervé Bazin; D. Robert Sutherland; Nicholas Tidman; Melvyn F. Greaves
No coin nor oath required. For personal study only.
Four distinct rat monoclonal antibodies against the common ALL antigen (CALLA, gp 100) were obtained in a single fusion. Rat AL2, AL3, AL4, AL5 and the previously reported mouse J5 monoclonal antibodies identified the same subsets of leukaemic cells. AL2 and AL3 reacted weakly with terminal transferase‐positive cells in normal bone marrow and foetal liver, as well as with a minority of mature granulocytes in blood. Immunoprecipitation experiments and competitive binding assays demonstrated that the four rat antibodies and J5 bound to the same glycoprotein of approximately 100, 000 mol. wt This set of rat monoclonal antibodies directed against CALLA has not only a diagnostic usefulness but may also be of therapeutic value.
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