IFN-γ production in cytokine-primed NK cells.

NK cells were primed with or without cytokines as indicated for 3 days. The INF-γ produced in the medium at the end of 3 days was quantified by ELISA (A). These primed cells were then washed and treated with or without IL-12 for 3 days. The IFN-γ produced from the cells was quantified by ELISA (B). Net IFN-γ production, representing the difference between that produced in the presence and absence of IL-12, is shown.