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Variations in histological structure of the duodenums and effects of HT on VH/CD ratios. (A) H&E staining; (B) VH/CD ratios. * Indicates minimum significant differences (P < 0.05), and ** indicates highly significant differences (P < 0.01). Abbreviations: HT, hydroxytyrosol; VH/CD, villi height/crypt depth.
