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Hyperreflexia (light gray), diplopia (black), and impaired vibration sense at ankle (gray) (panels A and C) and NfL levels (panels B and D) among controls, preataxic and ataxic carriers with a pathologic ATXN1 (panels A and B) and ATXN3 (panels C and D) expansion. INAS = Inventory of Nonataxia Signs; NfL = neurofilament light chain.
