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Copper coordination in representative blue copper proteins in their oxidized forms. (A) P. aeruginosa azurin; (B) T. ferrooxidans rusticyanin; (C) P. nigra plastocyanin; (D) P. denitrificans amicyanin; (E) C. sativus cumber basic protein; (F) C. sativus stellacyanin. Spheres indicate carbon (green), oxygen (red), nitrogen (blue) and copper (tan). The protein tertiary structure is shown as a partially transparent grey ribbon.
