"natural killer (NK)" . "Natural killer cell \u00A7 Adaptive features" . "natural killer cells (NK cells)" . "natural killer" . . "antibody-dependent cell-mediated cytotoxicity" . "kill cells" . "NK cell" . "uterine natural killer (uNK) cells" . "natural killer (NK) cells" . "missing-self hypothesis" . "natural killer (NK) cell" . . "Natural Killer (NK) cells" . "Natural killer cell" . "natural killer cell" . "Natural killer" . . . "Natural_killer_cell#Missing_'self'_hypothesis" . "natural killers cells" . "Natural Killer cells" . "uterine NK cells during pregnancy" . . "NK - cell" . "natural killer cells (NK)" . . "Natural killer (NK) cells" . . . "''natural killer cells''" . "Natural killer cell#NK cell receptors" . . . . "NK" . "natural killers" . "NK cell receptors" . "Killer cell" . . "NKT cells" . "natural-killer (NK) cells" . . "Natural killer cells" . . "CD56+ NK cells" . "Natural Killer" . . "NK cells" . "Natural killer cell" . . "natural killer cells" .