text_1: The ureABIEFGH gene cluster encodes urease maturation proteins : UreD/UreH, UreE, UreF, and UreG.
text_2: Urease produces NH(3) and CO(2), neutralizing entering protons and thus buffering the periplasm to a pH of roughly 6.1 even in gastric juice at a pH below 2.0.