Histidine Biosynthesis (early stages)

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ribose activation.
histidine biosynthesis (late stages).
EC adenine phosphoribosyltransferase
EC ATP phosphoribosyltransferase
EC phosphoribosyl-AMP cyclohydrolase
EC phosphoribosyl-ATP diphosphatase
EC 1-(5-phosphoribosyl)-5-[(5-phosphoribosylamino)methylideneamino)imidazole-4-carboxamide isomerase