Purine Biosynthesis (early stages)

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5-hydroxybenzimidazole biosynthesis.
purine biosynthesis (late stages).
thiamine diphosphate biosynthesis (late stages).
ribose activation.
EC phosphoribosylglycinamide formyltransferase 1
EC phosphoribosylformylglycinamidine cyclo-ligase
EC phosphoribosylamine—glycine ligase
EC phosphoribosylformylglycinamidine synthase