2JKY:
reference: Functional significance of four successive glycine residues in the pyrophosphate binding loop of fungal 6-oxopurine phosphoribosyltransferases., Moynie L, Giraud MF, Breton A, Boissier F, Daignan-Fornier B, Dautant A, Protein Sci. 2012 Aug;21(8):1185-96. doi: 10.1002/pro.2098. Epub 2012 Jun 11. PMID: 22610485

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