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Nature Immunology 9, 457–459 (1 May 2008) | doi:10.1038/ni0508-457

CD3|[epsiv]|: PeRuSing for positive selection

Jonathan S Maltzman & Gary A Koretzky

Signals mediated by the T cell antigen receptor (TCR) are required for the development and homeostasis of T lymphocytes. The molecular mechanism by which engagement of the αβ TCR by complexes of peptide and major histocompatibility complex (pMHC) initiate signal-transduction cascades has been a matter of intense investigation since the TCR itself was identified.