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Figure 1 Partial deoxyribonucleic acid sequence of KCNH2 exon 7 for the wild-type (A, single black peak) and mutant KCNH2 gene demonstrating the same mutation in Patient 1 (heterozygous; B, two peaks: black and green) and Patient 2 (homozygous; C, single green peak). The latter was confirmed by PCR cloning and sequencing (D, single green peak).
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