IES conservation in genes related by WGD.

<p>A) Filled contour plot of the correlation between the size of IES pairs that have been conserved with respect to the recent WGD. The x axis gives the size in bp of the first IES, the y axis gives the size in bp of the second IES found in the ohnologous gene and the color of each point indicates the number of times that combination of x,y values was found in the data set. The color legend is shown to the right of the figure, the numbers represent counts of the x,y value pairs; the rainbow colors are distributed according to a log2 scale. B) Size distribution of IESs conserved in “quartets” i.e. genes that are still present in 4 copies in the genome after duplication at both the intermediate and the recent WGD events. In order to compare size distributions for different classes of IES, they are represented as experimental cumulative distribution functions. The ripples in each curve correspond to the peaks of a histogram representation as in <a href="http://www.plosgenetics.org/article/info:doi/10.1371/journal.pgen.1002984#pgen-1002984-g003" target="_blank">Figure 3A</a>. The curves are for IESs that must have originated from an ancestral IES acquired before the intermediate WGD (grey, N₁₁₁₁ IESs), IESs that must have originated from an ancestral IES acquired before the recent WGD (orange, N₁₁₀₀ IESs) and the IESs that might have been acquired since the recent WGD (blue, N₁₀₀₀ IESs).