1UDE:
reference: Crystal Structure of the Hyperthermophilic Inorganic Pyrophosphatase from the Archaeon Pyrococcus horikoshii., Liu B, Bartlam M, Gao R, Zhou W, Pang H, Liu Y, Feng Y, Rao Z, Biophys J 2004 Jan;86(1):420-7. PMID: 14695284

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