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Review Question - QID 215192

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QID 215192 (Type "215192" in App Search)
A 12-year-old boy is brought to a cardiologist for evaluation of a heart murmur that was detected by his pediatrician. He was born at term to a G1P1 mother and had significant developmental delay and intellectual disability throughout childhood. On presentation, he is found to have a mid-systolic click followed by a blowing murmur best heard at the apex of the heart. Physical exam also reveals an elongated face and macroorchidism. Which of the following genetic sequences is most likely abnormal in this patient?