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A 25-year-old man presents with a 2-year history of low back pain and stiffness, worse in the mornings and improving with exercise. He also reports alternating buttock pain. Examination reveals reduced lumbar flexion and tenderness over the sacroiliac joints. He carries the HLA-B27 gene. X-ray of the sacroiliac joints shows bilateral sacroiliitis. What is the most likely diagnosis?

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