Electrocardiogram sequence of mitochondrial genome variants detected in HCM patients. a, The upper section shows the mutant type nucleotide ‘A’ at position 2552 in the 16S-rRNA gene while the lower section shows wild type nucleotide ‘T.’ b, The upper section shows the mutant type nucleotide ‘G’ at position 1811 in 16S-rRNA gene, while the lower section shows wild type nucleotide ‘A.’ c, The upper section shows the mutant type nucleotide ‘A’ at position 1888 in 16r-RNA gene, while the lower section shows wild type nucleotide ‘G.’ d, The upper section shows the mutant type nucleotide ‘T’ at position 2467 in 16r-RNA gene, while the lower section shows wild type nucleotide ‘A.’