1. b.40.5 Inorganic pyrophosphatase OB-fold barrel, closed or partly opened n=5, S=10 or S=8; greek-key 1mjy d1mjya_ A:23-27,69-74,86-98,99-110,127-146 1twl d1twla_ A:28-36,70-75,87-99,100-111,126-145
2qza A:279-287,292-296,320-327,328-335,355-363 2qyu A:279-287,292-296,320-327,328-335,355-363