Fig. 6From: A High-Throughput Assay for Screening of Natural Products that Enhanced Tumoricidal Activity of NK CellsAndrographolide increased IFN-γ secretion by NK cells. Expanded NK cells and A549 cells were co-cultured with various concentrations (1 μM to 50 μM) of andrographolide. After 24 h, IFN-γ release in supernatant was measured by ELISA methodBack to article page