Effect of IFN-γ on C-C chemokine secretion. Monocytes were incubated for 72 hours with IFN-γ (500 U/mL), and the supernatants from untreated and IFN-γ–treated cells were assayed for MIP-1, MIP-1β, and RANTES by ELISA. Results are representative of 3 cord blood samples (*P < .05, IFN-γ vuntreated).