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Nk cells --> natural killer cells

nk cells have an instrumental role in innate imune response against bacterial,viruses and parasitic pathogens.they arelarge granular lymphocytes which do not express markers of either t or b-cell lineage. These cells do possess fc receptors for igg and can kill target cells using antibody-dependent cell-mediated cytotoxicity. Nk cells can also use perforin to kill cells in the absence of antibody. Killing may occur without previous sensitization.

Synonym: nk cells.