TY - GEN AU - Lotzová,E TI - Definition and functions of natural killer cells SN - 1018-8916 PY - 1994///0119 KW - Antigens, Surface KW - immunology KW - Cytokines KW - Cytotoxicity, Immunologic KW - Humans KW - Killer Cells, Lymphokine-Activated KW - Killer Cells, Natural KW - Receptors, Immunologic KW - T-Lymphocytes N1 - Publication Type: Journal Article; Research Support, Non-U.S. Gov't; Review ER -