The gastro-intestinal tract extends from mouth to anus. It is divided into three parts- upper part from mouth to duodenum, the middle part includes duodenal papilla to colon and the lower part extends from colon to anus. They are also termed as fore gut, mid gut and hind gut.

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Clinical & Experimental Gastroenterology & Hepatology, Journal of Clinical & Experimental Gastroenterology, Clinical and Experimental Gastroenterology, Dove Press, Gastroenterology, Japanese Journal of Surgery & Medicine, The American Journal of Gastroenterology, Journal of Gastroenterology, Gastroenterology Open Access Journals, Journal of Clinical Gastroenterology, Gastroenterology & Hepatology, Open Access Gastro Journal‎, World Journal of Gastroenterology, Clinical Gastroenterology and Hepatology, Journal of Gastroenterology, Hepatology and Endoscopy, Canadian Journal of Gastroenterology and Hepatology, BMJ Open Gastroenterology, Gastroenterology Report. Journal of Proteins & Peptides, International Journal of Biomedical Investigation, Clinical & Experimental Gastroenterology & Hepatology, Japanese Journal of Surgery & Medicine, Medical Case Reports Journal, Medical Case Reports, Clinical and Medical Case Reports, Clinical Case Reports, Journal of Medical Case Reports, International Journal of Pharmaceutics and Pharmacology, International Journal of Clinical Anesthesia, International Journal of Peptide and Protein Research, Protein and Peptide Letters, Trends in Peptide and Protein Sciences, Protein Peptide Interactions, Peptides, Elsevier, World Research Journal of Peptide and Protein, Journal of Peptide Science, European Peptide Society, Current Protein & Peptide Science, Peptide and Protein Delivery, ScienceDirect, Biomedical Research, Biomedical Investigation, Allied Academies, Journal of Biomedical Research, Clinical and Experimental Gastroenterology, Clinical and Experimental Hepatology, Dove Press, Journal of Clinical & Experimental Hepatology, Japan Journal of Medicine, Japan Journal of Surgery, Japanese Journal of Surgery, Japanese Journal of Medicine, Journal of Clinical Anesthesia, Journal of Anesthesia and Clinical Research, Journal of Anesthesiology, Journal of Surgery and Anesthesia