Figure 6From: Phenotype, origin and estimated prevalence of a common long QT syndrome mutation: a clinical, genealogical and molecular genetics study including Swedish R518X/KCNQ1families The geographic distribution of the two northern river valley regions identified as the origins of the Swedish LQTS founder mutations Y111C/ KCNQ1 (left) and R518X/ KCNQ1 (right). Back to article page