5DYH:
reference: Unusual Synergism of Transferrin and Citrate in the Regulation of Ti(IV) Speciation, Transport, and Toxicity., Tinoco AD, Saxena M, Sharma S, Noinaj N, Delgado Y, Quinones Gonzalez EP, Conklin SE, Zambrana N, Loza-Rosas SA, Parks TB, J Am Chem Soc. 2016 May 4;138(17):5659-65. doi: 10.1021/jacs.6b01966. Epub 2016, Apr 26. PMID: 27070073

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