Proliferative response of PBMCs to various stimuli.

PBMCs were cultured in medium alone (□), containing 2000-fold diluted phytohemagglutinin-P (░), 5 ng/mL phorbol myristyl acetate plus 500 ng/mL ionomycin (▧), 50 ng/mL human IL-2 (▪), or 100-fold diluted poke weed mitogen (▨). Results represent the mean ± SD of triplicate wells.