Purine Biosynthesis (early stages)

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purine biosynthesis (late stages).
thiamine diphosphate biosynthesis (late stages).
ribose activation.
EC 2.1.2.2 phosphoribosylglycinamide formyltransferase
EC 6.3.3.1 phosphoribosylformylglycinamidine cyclo-ligase
EC 6.3.4.13 phosphoribosylamine—glycine ligase
EC 6.3.5.3 phosphoribosylformylglycinamidine synthase