Abstract
The reactivity of murine lymphoid tissue with biotinylated F(ab')2 fragments of monoclonal antibody VE7 (BIOT VE7), which reacts with gp52 of murine mammary tumor virus (MuMTV), was tested with fluoresceinated avidin in an indirect fluorescent antibody assay on live splenocytes. A small percentage of splenic lymphocytes in C3H/He mice infected exogenously with MuMTV, and in C57BL/6 mice that, like C3H/He, harbor several endogenous MuMTV proviruses in their genomes, were reactive with the monoclonal antibody. The antigen-positive splenocytes were shown to represent a subpopulation of B cells. The possible nature of the B cell-associated antigen recognized by monoclonal antibody VE7 is discussed.
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