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Mean antigen-specific IgG (A) and IgA (B) memory B cell responses to Ogawa and Inaba OSP, as percentages of total memory B cells, with error bars representing standard error of the mean. Statistically significant differences relative to baseline (Day 0) are indicated. (* = P<0.05, ** = P<0.01, *** = P<0.001, **** = P<0.0001).
