title: Evolutionary clock: nonconstancy of rate in different species.
abstract: By using various methods for comparing polypeptide sequences we find that the evolutionary divergence of rattlesnake cytochrome c from cytochromes c of species in other classes has been more rapid than that of cytochrome c of another reptile, the snapping turtle. This suggests that the evolutionary rate of change of cytochromes c is species-dependent as well as time-dependent.
mesh_terms: D000595:Amino Acid Sequence; D000596:Amino Acids / Q000032:analysis; D000818:Animals; D005075:Biological Evolution; D001717:Birds; D003580:Cytochromes / Q000032:analysis*; D005815:Genetic Code; D010455:Peptides / Q000032:analysis; D012911:Snakes; D013045:Species Specificity; D013223:Statistics as Topic; D014426:Turtles
chemical_list: D000596:Amino Acids; D003580:Cytochromes; D010455:Peptides