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TT-specific serum IgG1 (A), IgG2c (B), and IgG2b (C) Ab titers. Groups of GALT-deficient mice (as described in the legend to Fig. 1) were orally immunized with rSalmonella-Tox C. Four weeks after the immunization, serum samples were collected and examined for TT-specific Abs by ELISA. The results are representative of three separate experiments. Each group consisted of three or four mice.
