Figure 2.

Intron densities in the different genomes. (A) Percentage of sequences harboring introns in the different genomes. (B) Average number of introns per sequence in the different genomes. All sequences means all protein coding genes in the genomes for each species. Orthologs means the subset of orthologs identified by the InParanoid algorithm for each species versus human. As a consequence, for human, orthologs refers to an average of the ortholog sets identified versus each of the other species.