1ZLQ:
reference: Crystallographic and spectroscopic evidence for high affinity binding of FeEDTA(H2O)- to the periplasmic nickel transporter NikA., Cherrier MV, Martin L, Cavazza C, Jacquamet L, Lemaire D, Gaillard J, Fontecilla-Camps JC, J Am Chem Soc 2005 Jul 20;127(28):10075-82. PMID: 16011372

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