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GTP biosynthesis
methanopterin biosynthesis (part 2)
EC 1.13.11.81 7,8-dihydroneopterin oxygenase
EC 2.7.6.3 2-amino-4-hydroxy-6-hydroxymethyldihydropteridine diphosphokinase
EC 3.1.4.56 7,8-dihydroneopterin 2',3'-cyclic phosphate phosphodiesterase
EC 3.5.4.39 GTP cyclohydrolase IV
EC 4.1.2.25 dihydroneopterin aldolase