The association of copper to Riboflavin Binding Protein (RBP) from egg white has been studied by electron paramagnetic resonance (EPR) and X-ray absorption (XAS) spectroscopies. The type II site contains a mix of copper I and II in an oxygen rich environment.
Biochemistry | Molecular Biology
Smith, Shelia R.; Bencze, Krisztina Z.; Wasiukanis, Kristen; Stemmler, Timothy L.; and Benore-Parsons, Marilee, "Association of Copper to Riboflavin Binding Protein; Characterization by EPR and XAS" (2008). Faculty Publications. Paper 15.