THEMIS: Two models, different thresholds.
THEMIS, a recently identified T-lineage-restricted protein, is the founding member of a large metazoan protein family. Gene inactivation studies have revealed a critical requirement for THEMIS during thymocyte positive selection, implicating THEMIS in signaling downstream of the T cell antigen receptor (TCR), but the mechanistic underpinnings of THEMIS function have remained elusive. A previous model posited that THEMIS prevents thymocytes from inappropriately crossing the positive/negative s...Expand abstract
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