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Cytotoxicity enhancing effects of DI3A and I3A on NK cells. (A) H1299 cells or (B) H1975 cells were co-cultured with NK cells at the E: T ratio of 1:1. Then cells were treated with DI3A or I3A at the indicated concentrations. Lysis was assessed using calcein release assay after 4 h incubation. Data shown represent means ± SD, *p < 0.05; **p < 0.01.
