Figure 1: Pathways of purine metabolism.

PRPP, phosphoribosyl pyrophosphate; SAICAR, succinylaminoimidazolecarboxamide ribotide; AICAR, aminoimidazolecarboxamide ribotide; IMP, inosine monophosphate; S-AMP, adenylosuccinate; S-Ado, succinyladenosine; XMP, xanthosine monophosphate.

1, adenylosuccinate lyase; 2, adenylosuccinate synthetase; 3, AMP deaminase; 4, cytosolic 5'-nucleotidase; 5, adenosine deaminase; 6, purine nucleoside phosphorylase; 7, xanthine oxidase; 8, hypoxanthine-guanine phosphoribosyltransferase; 9, adenine phosphoribosyl-transferase.

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