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Xanthosine-5'-Triphosphate (5'-XTP), a nucleotide, is produced by deamination of purine bases[1].

ChEBI: The xanthosine 5'-phosphate in which the 5'-phosphate is a triphosphate group.

[1] Davies O, et, al. Characterisation of multiple substrate-specific (d)ITP/(d)XTPase and modelling of deaminated purine nucleotide metabolism. BMB Rep. 2012 Apr;45(4):259-64. DOI:10.5483/bmbrep.2012.45.4.259
[2] Lin S, et al. Cloning, expression, and characterization of a human inosine triphosphate pyrophosphatase encoded by the itpa gene. J Biol Chem. 2001 Jun 1;276(22):18695-701. DOI:10.1074/jbc.M011084200