Expression of occludin and ZO-1 in the intestine were detected by immunohistochemistry, using rabbit polyclonal antibody against occluding (BIOSS, Beijing, China, 1:200 dilution) and ZO-1 (BIOSS, China,1:500 dilution). Slides were evaluated by Image-Pro Plus version 6.0 (Media Cybernetics Inc., Bethesda, MD, USA), calculating the mean of optical density.
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