Most abundant codons found in each amino acid of vertebrate mitogenomes.

<p>If for a given amino acid there was more than one most abundant codon in a mitogenome, then we considered that there was no most abundant codon (“none”). The mitogenomes of the three fish species with codon usage reversal are indicated in numbers below their respective exhibited codon: 1-<i>Albula glossodonta</i> (NC_005800), 2-<i>Bathygadus antrodes</i> (NC_008222), and 3-<i>Tetrabrachium occelatum</i> (NC_013879).