T lymphocyte development in p56lck deficient mice: allelic exclusion of the TcR β locus is incomplete but thymocyte development is not restored by TcR β or TcR αβ transgenes

T lymphocyte development in p56lck deficient mice: allelic exclusion of the TcR β locus is incomplete but thymocyte development is not restored by TcR β or TcR αβ transgenes