The absence of gastric urease in germ-free animals.
D000818:Animals; D002415:Cats; D002645:Chickens; D004285:Dogs; D005333:Fetus / Q000201:enzymology; D005753:Gastric Mucosa / Q000201:enzymology*; D005856:Germ-Free Life; D006168:Guinea Pigs; D006801:Humans; D051381:Rats; D012756:Sheep; D014510:Urease / Q000032:analysis*
D014510:Urease