Review Question - QID 108473

A 45-year-old male is worried because he has been experiencing uncontrolled writhing movements. He admits that over the past year he has been more forgetful while performing basic tasks (i.e., balancing the checkbook), and his wife complains that his not been acting like himself. He is afraid that he may be getting depressed from these symptoms and from the fact that he is experiencing frontal balding. His past medical history includes diabetes and mild intellectual disability. A brain section from a patient with the same disease is shown (Figure A). The affected gene in this patient would most likely have an increased number of which of the following sequences?