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J8-specific serum IgG (a) and salivary IgA (b) titers in outbred Swiss mice models after second boost (experiment 2). ns, p > 0.05; * p < 0.05; ** p < 0.01; *** p < 0.001; **** p < 0.0001. PBS: phosphate buffer solution, CTB: cholera toxin B.
