title: Bicentennial overview of intestinal microecology.
mesh_terms: D000328:Adult; D000818:Animals; D004063:Digestion; D005753:Gastric Mucosa / Q000648:ultrastructure*; D006801:Humans; D007413:Intestinal Mucosa / Q000648:ultrastructure*; D007422:Intestines / Q000382:microbiology* / Q000502:physiology; D008855:Microscopy, Electron, Scanning; D008871:Microvilli / Q000648:ultrastructure; D013270:Stomach / Q000502:physiology