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De novo synthesis of uridine: ① carbamoyl phosphate synthetase (CPS II); ② aspartate transcarbamoylase (ATCase); ③ dihydroorotase (DHO); ④ dihydroorotate dehydrogenase (DHODH); ⑤ orotate phosphoribosyltransferase; ⑥ orotidine 5′-phosphate decarboxylase; ⑦ nucleotidase; ⑧ uridine phosphorylase.
