623095.fig.004a
(a)
623095.fig.004b
(b)
623095.fig.004c
(c)
623095.fig.004d
(d)
Figure 4: Schematic drawings showing the possible evolutionary changes of UGA (a), AUA (b), AAA (c), and AGR (d) codons in animal mitochondrial genomes. * In order to exclude too complicated situations, simple formulas were adopted for the process of the possible evolutionary changes of AGR codons in this figure. For details, see Text.