##gff-version 3 A7X764 UniProtKB Chain 1 234 . . . ID=PRO_1000063236;Note=1-(5-phosphoribosyl)-5-[(5-phosphoribosylamino)methylideneamino] imidazole-4-carboxamide isomerase A7X764 UniProtKB Active site 9 9 . . . Note=Proton acceptor;Ontology_term=ECO:0000255;evidence=ECO:0000255|HAMAP-Rule:MF_01014 A7X764 UniProtKB Active site 131 131 . . . Note=Proton donor;Ontology_term=ECO:0000255;evidence=ECO:0000255|HAMAP-Rule:MF_01014