3FDC:
reference: Protein Binding and the Electronic Properties of Iron(II) Complexes: An Electrochemical and Optical Investigation of Outer Sphere Effects., Barker KD, Eckermann AL, Sazinsky MH, Hartings MR, Abajian C, Georganopoulou D, Ratner MA, Rosenzweig AC, Meade TJ, Bioconjug Chem. 2009 Sep 29. PMID: 19788194

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