Divergent effect of IL-4 and IFN-γ on MDC protein production. Supernatants of monocytes stimulated with or without IL-4 (20 ng/mL), IL-13 (20 ng/mL), and IFN-γ (500 U/mL) were examined for immunoreacting MDC using MoAb 252Y (A) or by MDC specific ELISA (B). Each panel shows the results of two independent experiments.