NK cells are large lymphocytes with granules and they target cells infected with intracellular organisms, like viruses, as well as cells that pose a threat like cancer cells.

NK细胞是有颗粒的大淋巴细胞，它们靶向被细胞内病原体（如病毒）感染的细胞，还有像癌细胞这样构成威胁的细胞。