Pyrimidine Biosynthesis

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ribose activation.
urea biosynthesis.
EC 1.3.3.1 dihydroorotate oxidase
EC 2.1.3.2 aspartate carbamoyltransferase
EC 2.4.2.10 orotate phosphoribosyltransferase
EC 3.5.2.3 dihydroorotase
EC 4.1.1.23 orotidine-5'-phosphate decarboxylase
EC 6.3.4.16 carbamoyl-phosphate synthase (ammonia)
EC 6.3.5.5 carbamoyl-phosphate synthase (glutamine-hydrolysing)