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Background and ObjectiveMalformations of the left ventricular outflow tract are one of the most common forms of congenital heart disorders. Recently, it has been shown that mutations in the NOTCH1 gene can lead to bicuspid aortic valve, aortic aneurysm, and hypoplastic left heart syndrome. The aim of our study was to estimate the frequency of NOTCH1 gene mutations/substitutions in patients with aortic...