Abstract

Monoclonal antibodies (mAbs), each reactive with thymocytes, neutrophils, and thrombocytes of the bullfrog, Rana catesbeiana, were raised and used for studies of hematopoiesis of metamorphic larvae. The mAbRc-T1, which immunoreacted exclusively with thymocytes in adults, was also strongly reactive to larval thymocytes. Thus the determinant Rc-T1 may provide an appropriate marker for thymocytes, although antigenic sharing is also seen in larval ovarian tissue. Neutrophils detectable by both mAbRc-N1 and Rc-N2 originated primarily in the mesonephros and showed up increasingly in peripheral blood of larvae. Thrombocytes detectable by mAbRc-P may originate in the larval spleen and/or liver but not in the mesonephros.

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