title: Functional endoscopy in the duodenum.
mesh_terms: D001706:Biopsy; D004396:Coloring Agents; D004378:Duodenal Diseases / Q000175:diagnosis; D004379:Duodenal Neoplasms / Q000175:diagnosis; D004381:Duodenal Ulcer / Q000473:pathology; D004386:Duodenum / Q000473:pathology; D004724:Endoscopy; D005756:Gastritis / Q000175:diagnosis; D006801:Humans; D007211:Indoles; D008751:Methylene Blue; D010437:Peptic Ulcer / Q000175:diagnosis; D011127:Polyps / Q000175:diagnosis; D013194:Staining and Labeling; D013274:Stomach Neoplasms / Q000175:diagnosis; D013451:Sulfonic Acids
chemical_list: D004396:Coloring Agents; D007211:Indoles; D013451:Sulfonic Acids; D008751:Methylene Blue