4O5V:
reference: Structural analysis and insight into metal-ion activation of the iron-dependent regulator from Thermoplasma acidophilum., Yeo HK, Park YW, Lee JY, Acta Crystallogr D Biol Crystallogr. 2014 May;70(Pt 5):1281-8. doi:, 10.1107/S1399004714004118. Epub 2014 Apr 29. PMID: 24816097

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