Evolutionary Clock: Nonconstancy of Rate in Different Species
- 11 August 1972
- journal article
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 177 (4048) , 530-532
- https://doi.org/10.1126/science.177.4048.530
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.Keywords
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