(A) Left panel: 3H-thymidine uptake (mean cpm±SEM) of human PBMCs cultured in the presence or absence of PHA with or without addition of human melanoma cells (representative of n=4 independent experiments). Right panel: IL-2, (B) IL-10 (C) IFN-γ-, and (D) IL-5- (left), and IL-4 (right) production by PHA-stimulated PBMCs cultured in the presence or absence of melanoma cells as determined by ELISPOT analysis. Illustrated are mean spots per well±SEM of replicate wells representative of n=3-4 independent experiments (*, P<0.05, NS, not significant). Representative ELISPOT wells are shown.