Previous Article Next Article Table of Contents Science, Vol.274, No.5293, 1750-1750, 1996 DOI10.1126/science.274.5293.1750 Export Citation Dating the Cenancester of Organisms Hasegawa M, Fitch WM Keywords:AMINO-ACID SITES;MITOCHONDRIAL-DNA;HETEROGENEITY;EVOLUTION Please enable JavaScript to view the comments powered by Disqus.