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Antigen-specific IgG antibodies in sera. Sera samples collected from mice orally immunized with pPG-Δ-E-α-β2-ϵ-β1/L. casei 393, pPG-2-α-β2-ϵ-β1/L. casei 393, pPG-T7g10-PPT/L. casei 393, and PBS were determined for levels of anti-α specific IgG (a), anti-β2 specific IgG (b), anti-ϵ specific IgG (c), and anti-β1 specific IgG (d) by ELISA (*p < 0.05, **p < 0.01). The results are presented as mean ± SD in each group.
