Regulation of CB2 receptor expression during CD40-mediated activation. Virgin and GC B-cell subsets were triggered by CD40 ligation in the presence of CD32⁺-L cells. Expression of CB2 receptors were quantitated at 24 and 48 hours by RT-PCR (A) and flow cytometry (B) as described in Figs 3 and 5. Data are representative of two different experiments performed from two different donors. *P ≤ .05.