Positive selection datasets showing the species trees used and the control tests in sister clades.

<p>Branches selected for the analyses are shown (ω) in different colors (green for the foreground/cactophilic lineages and red for the background/non-cactophilic lineages). Only the genes for which no evidence of positive selection on the background lineages were considered for further analyses (please see <a href="http://www.plosbiology.org/article/info:doi/10.1371/journal.pbio.3002832#sec012" target="_blank">Materials and methods</a> section).</p> <p>(PDF)</p>