Fig. 4From: Oral administration of propionic acid during lactation enhances the colonic barrier functionTwo of the major tight junction proteins, ZO-1 and Claudin-8, were stained different grades of brown by immunohistochemistry (X 400). The brown staining of the proximal colonic epithelia lining villi in the propionic acid group (c, d) was greater compared to the control group (a, b)Back to article page