Natural killer cells: NK cells need a license to kill


home to hundreds of species of bacteria, which live in homeostasis with the host immune system. It has long been known that germ-free mice — which are born and raised under sterile conditions and are therefore devoid of gut microflora — have systemic immune defects and that colonization of their gut with commensal bacteria corrects these defects. However… (More)
DOI: 10.1038/nri1691


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