The repetition of homologous sequences in the polypetide chains of certain cytochromes and globins.
D000595:Amino Acid Sequence; D003580:Cytochromes; D005815:Genetic Code; D005914:Globins; D006454:Hemoglobins; D008967:Molecular Biology; D009154:Mutation; D009211:Myoglobin; D009491:Neurospora; D010455:Peptides; D011549:Pseudomonas
D003580:Cytochromes; D006454:Hemoglobins; D009211:Myoglobin; D010455:Peptides; D005914:Globins