FIG 5.

Gene copy number does not follow the two-speed genome hypothesis. Core orthologous genes with a copy number of three are enriched in the gene-dense (rather than gene-sparse) regions of the genome. The background for each panel is a heatmap indicating gene abundance as in Fig. 3. Orange points (with transparency) are plotted over this background, where each point is a core orthologous gene that was determined to have three copies and was positioned based on their 3′ (y axis) and 5′ (x axis) intergenic distance as in Fig. 3. Background grid and axis ticks are identical to those in Fig. 3.