Spinocerebellar ataxia type 7 (SCA7). a neurodegenerative disease characterized by cerebellar ataxia and retinal degeneration. is caused by an abnormal CAG repeat expansion in the ATXN7 gene coding region. The onset and severity of SCA7 are highly variable between patients. https://spencertifieders.shop/product-category/laserdisc-player-parts/