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Mitogen-free and serum-free supernatants (SNs) from cultures of phytohaemagglutinin (PHA)-stimulated Xenopus splenocytes, co-stimulated thymocytes, induced proliferation of splenic and thymic lymphoblast and supported growth of alloreactive T-cell lines. These SNs had no effect on 'resting' splenocytes, as measured by uptake of tritiated thymidine ([3H]TdR). Growth-promoting activity was also detected in SNs of cultures containing alloreactive T-cell lines and either PHA or irradiated stimulator cells that expressed the original priming alloantigens. Thus, T lymphocytes appear to be involved in producing, as well as responding to, a Xenopus T-cell growth factor (TCGF). TCGF activity could be absorbed from these active SNs with PHA-activated splenic blasts. No functional cross-reactivity among different mammalian interleukin-2 (IL-2) and Xenopus TCGF preparations was detected.
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