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Review Question - QID 213914

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QID 213914 (Type "213914" in App Search)
A 12-year-old male has worsening upper back pain, shoulder and hip stiffness, and bilateral foot pain with shoe wear. He denies any acute injury. Exam of his lower extremities is notable for decreased passive and active range of motion of the left hip and bilateral hallux valgus deformities. His mother states he has had toe deformities since birth and radiographs are shown in Figure A. A genetic mutation in which protein is associated with this syndrome?
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