A 2-week-old female infant presents with cyanosis, a single loud S2, and a systolic ejection murmur. Echocardiography reveals tetralogy of Fallot (TOF) with a large ventricular septal defect, overriding aorta, right ventricular hypertrophy, and pulmonary stenosis. The parents ask which embryological process went wrong. Which of the following best explains the pathogenesis of TOF?

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