Figure 3.
The effect of exogenous cytokines on the proliferation of B cells. Purified B cells were stimulated with 10 μg/ml lipopolysaccharide (LPS) in the absence or presence of exogenous cytokines. Cell proliferation was determined by [3H]thymidine added to the cultures for the last 6 hr of the 72-hr incubation period. Each bar represents the mean ± SD from five independent determinations. Values with asterisks are significantly (*P < 0·05, **P < 0·01, ***P < 0·001) different from the control (the cells stimulated in the absence of added cytokines).