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The human hypoxanthine-guanine phosphoribosyltransferase enzyme

The human hypoxanthine-guanine phosphoribosyltransferase (HPRT) homotetramer with magnesium ions (light blue). (Source: Keough DT, Guddat LW, Kaiser MM, Hockova D, Wang TH, Janeba Z. Human HGPRT in complex with (S)-HPEPG, an acyclic nucleoside phosphonate. Protein Data Bank 2016. Available at Creative Commons Attribution-Share Alike 4.0 International.

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