title: Mucosal biopsy of the gastrointestinal tract.
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D001706:Biopsy / Q000295:instrumentation / Q000379:methods; D002648:Child; D002675:Child, Preschool; D003092:Colitis / Q000473:pathology; D003106:Colon / Q000473:pathology; D005753:Gastric Mucosa / Q000473:pathology*; D005756:Gastritis / Q000473:pathology; D005767:Gastrointestinal Diseases / Q000473:pathology*; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D007410:Intestinal Diseases / Q000473:pathology; D007413:Intestinal Mucosa / Q000473:pathology*; D007414:Intestinal Neoplasms / Q000473:pathology; D007421:Intestine, Small / Q000473:pathology; D008875:Middle Aged; D013270:Stomach / Q000473:pathology; D013274:Stomach Neoplasms / Q000473:pathology