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Science 11 August 1972:
Vol. 177. no. 4048, pp. 530 - 532
DOI: 10.1126/science.177.4048.530
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Articles

Evolutionary Clock: Nonconstancy of Rate in Different Species

Thomas H. Jukes 1 and Richard Holmquist 1

1 Space Sciences Laboratory, University of California, Berkeley 94720

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.


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Silent nucleotide substitutions and the molecular evolutionary clock.
T. Jukes (1980)
Science 210, 973-978
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Science. ISSN 0036-8075 (print), 1095-9203 (online)