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Biosynthesis of uric acid. AMP, adenosine monophosphate; GMP, guanine monophosphate; HGPRT, hypoxanthine-guanine phosphoribosyltransferase; IMP, inosine monophosphate; NT, 5′-nucleotidase; PNP, purine nucleoside phosphorylase; XMP, xanthosine monophosphate.
