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The complex formed between Phormidium cyt f and Phormidium PC in the presence of Zn2+. A representative complex was selected from the 10 chosen for detailed analysis as described in the Methods section. The peptide backbone is shown as well as selected residues. The cyt f heme (black); cyt f-Y1 and PC-Y83 (yellow); Arg (dark blue); Lys (light blue); Glu (red); and Asp (magenta). Cyt f residues are labeled in red; PC residues are labeled in black.
