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This article, published in Genome Research, is available under a Creative Commons License (Attribution-NonCommercial 4.0 International), as described at http://creativecommons.org/licenses/by-nc/4.0/.
Distributions of the four types of comparisons based on the simulation of 1000 random draws of 36 genera. The dotted lines represent the number of each of the comparison types in our sample of 36 genera from which sequenced genomes were analyzed.