Fig. 3From: A High-Throughput Assay for Screening of Natural Products that Enhanced Tumoricidal Activity of NK CellsOptimization of NK and target (A549) cells culturing conditions. NK cells were co-cultured with A549 cells at different E:T ratios in 96-well plates for 24 h, and then IFN-γ secretion in supernatant was detected by ELISA assay. The data shown here is a representative of three independent experiments. ***, P<0.001Back to article page