title: Letter: Aetiology of Crohn's disease.
mesh_terms: D000818:Animals; D001344:Autopsy; D003424:Crohn Disease / Q000209:etiology* / Q000473:pathology; D006168:Guinea Pigs; D006801:Humans; D007082:Ileum / Q000473:pathology; D051379:Mice; D051381:Rats; D014020:Tissue Extracts / Q000008:administration & dosage
chemical_list: D014020:Tissue Extracts