Which of the following are large, granular lymphoid cells that are mediators of antibody- dependent cellular cytotoxicity?: (A) macrophages, (B) natural killer (NK) cells, (C) T lymphocytes, suppressor subset, (D) B lymphocytes
Answer is B. NK cells may be of T-cell lineage or monocyte-macrophage lineage. They appear to play an important role in surveillance mechanisms.