<strong>B Cell Stim ulation:</strong> 5 x 10e5 Human PBMC were incubated with the indicated concentrations of purified Mouse F(ab')2 Anti-Human IgM, clone UHB (#AM08147PU-N), for 48 hours. B cell proliferation was determined by 3H-Thymidine incorporation assay. Amount Used: < / = 10 ug/mL