Rapidly evolving gene families in mammals.

<div><p>Horizontal bars indicate the relative rates of change among taxa for each family (where rate is the change in number of genes per million years).</p> <p>The top bar indicates the hypothetical case where each lineage has an equal evolutionary rate.</p> <p>Bars are partitioned by the color codes assigned to the taxon names at the far right.</p> <p>Boxes immediately right of each bar indicate whether changes in that family are expansions (+) or contractions (−) in each taxon.</p> <p>Each column of boxes represents a single taxon, color coded in the same order as the bars.</p> <p>Vertical bars on the right span families that were found to be least likely in the same lineage under the random model of gene gain and loss.</p> <p>Families with ambiguous or unknown function are left out of the figure to improve legibility.</p> <p>The complete statistical results are presented in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0000085#pone.0000085.s011" target="_blank">Table S7</a>.</p>