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Long QT syndrome (LQTS) is a genetic disorder that affects the heart's electrical system, leading to abnormal heart rhythms (arrhythmias). It is caused by mutations in genes encoding ion channels, primarily those responsible for the movement of potassium, sodium, or calcium ions in and out of heart cells. These mutations disrupt the repolarization phase of the ________ _________ _________ ________ ________.
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