Volume 4 (2004) - July 2004
Martin Irestedt, Jon Fjeldså, Johan AA Nylander, Per GP Ericson BMC Evolutionary Biology 2004, 4:23 (30 July 2004)
Phylogenetic analysis of the Thamnophilidae (typical antbirds), based on both nuclear and mitochondrial DNA sequences, reveals a need for some taxonomic revisions, while broadly confirming the traditional classification of the family.
I King Jordan, Yuri I Wolf, Eugene V Koonin BMC Evolutionary Biology 2004, 4:22 (6 July 2004)
Following gene duplication there is a period of rapid evolution, which then slows down in cases where the original gene has an important biological function and the duplicate is retained.