Term Name:	GTP cyclohydrolase I activity
Synonyms:	dihydroneopterin triphosphate synthase activity, GTP 7,8-8,9-dihydrolase activity, GTP 8-formylhydrolase activity, guanosine triphosphate 8-deformylase activity, guanosine triphosphate cyclohydrolase activity
Definition:	Catalysis of the reaction: GTP + H2O = 7,8-dihydroneopterin 3'-triphosphate + formate + H+.
Ontology:	GO: Molecular Function [GO:0003934]    QuickGO    AmiGO