Figure 4
From: Comparative analyses of bidirectional promoters in vertebrates
Comparison of head-to-head and tail-to-tail gene pairs identified at orthologous positions. Bidirectional promoter data are graphed in green, with dots representing human and plus signs representing the other species. Tail-to-tail gene pairs are represented by purple markers in each species. All data are graphed as the cumulative percentage of the total number of orthologous regions mapped in the human genome.