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Humoral immune responses induced by different antigens. Log10 of titer kinetics for IgGs against rYbgF and rTolC (A). Titer kinetics of IgG1 and IgG2a against rYbgF (B). Titer kinetics of IgG1 and IgG2a against rTolC (C). IgG2a:IgG1 ratios for rYbgF and rTolC (D). Antibody titers were determined by ELISA and presented as log10, with the standard deviation indicated by an error bar.
