Figure 2. Sequence electropherograms of mitochondrial DNA mutations. A: The upper panel shows (arrow) the wild-type nucleotide G at the position 11,778 in MT-ND4 gene, while the lower panel shows the mutant allele A that changes the amino acid from alanine to valine. B: The upper panel shows (arrow) the wild-type nucleotide A at the position 1555 in 12S rRNA gene, while the lower panel shows the mutant allele G.