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De novo pyrimidine synthesis. CPS II, carbamoyl phosphate synthetase II; ATCase, aspartate carbamoyltransferase; DHOase, dihydroorotase; DHODH, dihydroorotate dehydrogenase; ODCase, OMP decarboxylase; PRPP, 5′-phospho-d-ribosyl-1-pyrophosphate.
