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Determination of cytokine levels in the serum obtained from pPG-α/L. casei 393–immunized mice. The levels of cytokines IL-2, IL-4, IL-10，IL-12, IL-17, and IFN-γ in serum samples collected on day 35 post-immunization were determined by means of an ELISA kit. Results are mean ± SD (**p < 0.01 as compared with groups pPG/L. casei 393 and PBS).
