"GTP cyclohydrolase IV"
"gtp cyclohydrolase iv"
GTP + H2O = 7,8-dihydroneopterin 2',3'-cyclic phosphate + formate + diphosphate + H(+)
gtp + h2o = 7,8-dihydroneopterin 2',3'-cyclic phosphate + formate + diphosphate + h(+)