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Analysis of OVA-specific serum antibodies in C57BL/6 mice immunized by the intranasal (i.n.) route with AdDP as the adjuvant. OVA-specific IgG titers from serum samples were determined by endpoint dilution ELISA. Each bar represents the group mean endpoint titer. The SEMs are indicated by vertical lines. Differences were statistically significant at P < 0.05 (*).
