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Diversity in substitution rates. Synonymous substitution rates per site per billion years (SSB) for different organisms and genomes plotted on a log scale. Black bars represent seed plant mitochondrial genomes. Average rates for animal taxa from Lynch et al. [20]; angiosperm chloroplast and nuclear estimates from Wolfe et al. [74]; mitochondrial rates for individual plant species taken from Cho et al. [5] and Mower et al. [4].
