Splenic B cells from wild-type (n = 3) and IL-21R−/− (n = 3 to 4) mice were co-cultured with in vitro skewed Th17 cells derived from OTII mice in the presence and absence of OVA323-339 peptides for 6 days. The levels of IgA, IgE, IgG1, IgG2b, IgG2c and IgG3 in the culture supernatants were measured by ELISA. Data show the mean ± SEM. *p<0.05, **p<0.01 vs. Medium; and †p<0.05, ††p<0.01 vs. wild-type B cells.