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Nakano, S., Sato, T. & Sakai, T. Studies on the ‘ invitro ’ method of penetration through the intestinal membrane passage of active polypeptides to intestinal wall. Gastroenterol Jpn 4, 27–28 (1969). https://doi.org/10.1007/BF02777254
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DOI: https://doi.org/10.1007/BF02777254