Abstract

Natural Killer cell functions are regulated by combinations of activating and inhibitory receptors, derived from a number of different gene families. This review focuses on receptors for MHC class I, which include the killer cell immunoglobulin-like receptors (KIR) and the CD94:NKG2 family of receptors. In particular the KIR are diverse and rapidly co-evolving with their classical MHC class I ligands. Thus NK cells are part of the innate immune system that are continuing to adapt to the challenges of pathogens.

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