##gff-version 3 P26720 UniProtKB Chain 1 254 . . . ID=PRO_0000141968;Note=1-(5-phosphoribosyl)-5-[(5-phosphoribosylamino)methylideneamino] imidazole-4-carboxamide isomerase P26720 UniProtKB Active site 8 8 . . . Note=Proton acceptor;Ontology_term=ECO:0000250;evidence=ECO:0000250 P26720 UniProtKB Active site 129 129 . . . Note=Proton donor;Ontology_term=ECO:0000250;evidence=ECO:0000250