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Fitch and Markowitz' theory of concomitantly variable codons (covarions) in evolution predicted the existence of functional correlation in amino acid residue mutations among present-day cytochromes c. Mutational analysis was carried out on yeast iso-2-cytochrome c, where hydrophobic core residues I20, M64, L85, and M98 and surface residue L9 were mutated, in selected combinations, to those found in...
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