Fig. 2

The schematic presentation of IFN-γ based high-throughput assay for screening of natural products. To identify potent natural products, human NK cells were first expanded, and then co-incubated with A549 cells in 96-well plates with or without natural products. After 24 h of co-culturing, supernatants were harvested and IFN-γ levels were measured by ELISA assay