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Gene dispensability in yeast and worm and phyletic patterns of the respective KOGs. (a) Distribution of essential and non-essential genes among different size classes of KOGs and LSEs in yeast Saccharomyces cerevisiae. (b) Distribution of essential and non-essential genes among different size classes of KOGs and LSEs in the nematode C. elegans. The number of species in the KOGs and LSEs is color-coded as indicated to the right of each plot.
