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Electron donor docking sites in CuNIRs. A, superposition of NeNIR (pink, tower loop in magenta) with the AxNIR-cytochrome c551 co-crystal structure (green, PDB code 2ZON) and NgNIR (gray, PDB code 1KBW). B, NeNIR surface colored by electrostatic potential. C, superpostion of NeNIR (pink and magenta) and NeMCO (blue, PDB code 3G5W) highlighting the tower loop. D, NeMCO (PDB code 3G5W) surface colored by electrostatic potential.
