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Correlation between cholera toxin B subunit (CTB)–specific IgG (A) or IgA (B) in memory B cell culture supernatant and the nos. of memory B cells in the same cultures, as demonstrated by standard enzyme-linked immunospot (ELISPOT) assay. For panel A, Spearman's ρ = 0.7042 and P < .001; for panel B, Spearman's ρ = 0.6733 and P < .001.
