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Red-A enhances NK cell-mediated killing of tumour cells. (A, B) The biophotonic cytotoxicity assay and (C, D) impedance assay were performed. E:T represents the ratio of effector cells vs. target cells. Data were pooled from three donors. Data represent mean ± S.E.M. *p< 0.05; **p< 0.01; ***p< 0.001.
