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Red-A increases the secretion of IFN-γ. (A, B) NK cells were co-incubated with A549 or H1299 tumour cells in the presence or absence of Red-A, and then IFN-γ was detected by ELISA assay. Data were pooled from three independent experiments. Data represent mean ± S.E.M. *p< 0.05; **p< 0.01.
