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Fig. 4. Epithelial Zn(II) accumulation rate (nmol g dry mass–1 h–1) following a 3 h intestinal perfusion of the intestine with Zn(II) solutions of varying concentration. Values are means ± S.E.M. (N=7–11). Epithelium represents tissue scraped from intestinal mucosal surface and includes epithelial cells and surface mucus.