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. 2004 Mar 16;2(3):e55. doi: 10.1371/journal.pbio.0020055

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Copyright: © 2004 Davis and Petrov.

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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The average rate of nonsynonymous evolution (K _A) for representative pairs of duplicate and singleton genes in the two study organisms S. cerevisiae (A) and C. elegans (B) is shown. Representative pairs of duplicate genes evolve significantly more slowly in both study organisms (Mann–Whitney U test, p < 0.001).