<qa>  What is the name of the two biopsies that will be obtained from the gastricIn addition, patients who will already be undergoing either upper or lower intestinal endoscopy for routine diagnostic or therapeutic purposes will be asked to agree to endoscopic mucosal brushings in addition to mucosal biopsies. Some will be patients with a diagnosis of primary sclerosing cholangitis, biliary atresia, or other intestinal disorders for whom upper or lower endoscopy is indicated for routine medical management. Others will have lower intestinal findings polyps or complaints e.g. occult blood in stool, or upper intestinal findings dyspepsia, reflux, and will be undergoing lower endoscopy colonoscopy or upper endoscopy for routine medical management. Up to 2 biopsies will be obtained from the gastric mucosa and of as many as 6 intestinal sites from each patient. In addition the following brushings will be taken: 2 from mid-esophagus, 2 from lesser curvature of the stomach, 2 from the second portion of the duodenum near the ampulla. 2 from the jejunum 5 cm from the Ligament of Trietz, and 2 from the ileum 10 cm from the ileocecal valve. We will also obtain brushing from the tongue. A sample of saliva will be taken. 