Pyrimidine Biosynthesis

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ribose activation.
urea biosynthesis.
EC dihydroorotate oxidase
EC aspartate carbamoyltransferase
EC orotate phosphoribosyltransferase
EC dihydroorotase
EC orotidine-5'-phosphate decarboxylase
EC carbamoyl-phosphate synthase (ammonia)
EC carbamoyl-phosphate synthase (glutamine-hydrolysing)