4F1V:
reference: The molecular basis of phosphate discrimination in arsenate-rich environments., Elias M, Wellner A, Goldin-Azulay K, Chabriere E, Vorholt JA, Erb TJ, Tawfik DS, Nature. 2012 Oct 3. doi: 10.1038/nature11517. PMID: 23034649

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