Figure 6

Genome-wide frequencies of homopolymeric amino acid tracts in the sea lamprey, human, and zebrafish. Peptide sequences with homopolymeric amino acid (HPAA) tracts (those with a stretch of no less than six consecutive residues) were extracted from public database and compared among the three vertebrates (see Methods for details). This figure shows the frequencies of HPAA tract-containing peptides. The results with the different criteria (stretches of no less than eight and ten consecutive residues) are shown in Additional file 12.