Fig. 2

Enrichment trend of the 501 SSRs across 719 genomes. SSRs in an organism are ranked based on their density, defined as the total number of bp covered by the SSR in an organism normalized to genome size (that is, bp covered/Mb). The density based ranking is used to generate a heat map as per the color scale indicated. The 501 SSRs are arranged in columns and the 719 organisms are arranged in rows (the 5 main groups are indicated on the right; subgroups are indicated below the heatmap). Alphabets on the left and numbers at the bottom of the heatmap indicate approximate positions of the tiles in a virtual grid (eg., A1 to K20). Arrows mark the positions for uniquely abundant (enriched) SSR signatures described in the text and in Table 1