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(a) Effects of weaning on expression of tight junction proteins in jejunal mucosa. (b) Representative blots of claudin-1, occludin, zonula occludens-1 (ZO-1) and β-actin in the jejunal mucosa of piglets. Values are means and SD represented by vertical bars. a,bMeans with different letters differ significantly (P < 0.05). The protein expression of all samples was expressed as fold changes, calculated relative to the preweaning (d 0 postweaning) pigs.
