Distribution of the inferred duplication (yellow boxes), intron gain (orange boxes) and intron loss (green boxes) events during evolution of the Drosophilidae and Culicidae species addressed in this work

<p><b>Copyright information:</b></p><p>Taken from "The nuclear OXPHOS genes in insecta: a common evolutionary origin, a common cis-regulatory motif, a common destiny for gene duplicates"</p><p>http://www.biomedcentral.com/1471-2148/7/215</p><p>BMC Evolutionary Biology 2007;7():215-215.</p><p>Published online 8 Nov 2007</p><p>PMCID:PMC2241641.</p><p></p> The branch lengths are not proportional to age