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NK-mediated cytotoxicity of liver isolated from the tumor-bearing mice. Livers were isolated and incubated with NK cell-sensitive YAC-1 in (A) nude mice or (B) Balb/c mice, respectively. Values are presented as the mean ± standard deviation. Difference between the control and low dose rmIL-15 group was significant, also between the control and high dose rmIL-15 group for NK activities (*P<0.05). NK, natural killer; rmIL-15, recombinant mouse interleukin-15.
