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Effects of L. casei on the morphology of intestinal villi and the expression of PCNA in chick jejunum. (A) H&E staining analysis of the morphology of intestinal villi. (B) Statistics of villus height, crypt depth, V/C value, and PCNA content. (C) Immunohistochemistry assay of PCNA expression. Results are presented as the mean ± SEM. Different letters between two groups indicate a significant difference (P < 0.05). Abbreviation: PCNA, proliferating cell nuclear antigen.
