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Structural comparison and variants of Cyt579. (A) Structure of cytochrome c6, 1cyjA (13), compared with the final model of Cyt579, predicting heme orientation, covalent binding with two Cys residues, and iron coordination complex with axial His and Met residues. (B) Amino acid substitutions are depicted for the two major variants of the Cyt579 gene, CG14-20 (red) and 8062-372 (blue) (see Fig. 1 for sequence alignment).
