1IQ7:
reference: Anion-mediated Fe3+ release mechanism in ovotransferrin C-lobe: a structurally identified SO4(2-) binding site and its implications for the kinetic pathway., Mizutani K, Muralidhara BK, Yamashita H, Tabata S, Mikami B, Hirose M, J Biol Chem 2001 Sep 21;276(38):35940-6. PMID: 11466309

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