A 38-year-old man presents with a 5-year history of progressive stiffness and weakness in both lower limbs. On examination, he has a scissor gait, brisk reflexes, bilateral ankle clonus, and extensor plantar responses. MRI brain and spine are normal. Genetic testing reveals a mutation in the SPAST gene. The inheritance pattern marked **B** in the diagram (Autosomal dominant SPAST/SPG4) accounts for what proportion of autosomal dominant hereditary spastic paraplegia cases?
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