Abstract
We have examined the question of whether there is an additional checkpoint in T cell development that regulates T cell receptor (TCR)-beta expression in CD25+44- thymocytes by mechanisms that are independent of the pre-TCR. Our analysis in various mutant mice indicates that all changes in cytoplasmic TCR-beta expression can be accounted for by pre-TCR-dependent signal mediation, putting into question the function of a putative pro-TCR.
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