Introduction
Natural killer (NK) cells, a variety of granular lymphocyte, are the first line of defence against infections and cancer. First identified by their ability to “naturally” kill tumour cells previously unrecognised by the host (Kiessling et al., 1975), these bone marrow-derived innate killers were later recognised as a sepa-rate lymphocyte lineage, obtaining both cytotoxicity and cytokine-producing effector functions (Trinchi-eri, 1989). NK cells circulate and patrol the blood system and are activated via cytokine signalling or up-on encountering target cells that express NK cell receptor ligands (Lanier, 2005). Lytic activity subse-quently proceeds against the infected or altered host cell (Gonzales et al., 2012). There are …show more content…
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