The hereditary spastic paraplegias (HSPs) are genetic motor neuron diseases characterized by progressive degeneration of corticospinal tract axons. Mutations in SPAST. encoding the microtubule-severing ATPase spastin. are the most common causes of HSP. https://www.soiebiologique.com/limited-price-Test-Evaluation-Command-ACU-Patch-Foliage-Green-flash-choice/