the natural and recombinant leucocyte interferon and natural immune interferon stimulated in vitro the activity of natural killer cells in most of the experiments ( 80.5 % ) in the 4 hour and 18 hour cytotoxic reactions both from patients with initially lowered level , and with normal or high level of cytotoxic action of natural killer cells .
C0021745
immune interferon
C0022688
natural killer cells