Tags: Huntington disease,Genetic Diseases, Inborn,Heredodegenerative Disorders, Nervous System,Chorea,Congenital, Hereditary, and Neonatal Diseases and Abnormalities,Pathological Conditions, Signs and Symptoms,Dementia,Nervous System Diseases,Basal Ganglia Diseases,Signs and Symptoms,Neurologic Manifestations,Brain Diseases,Movement Disorders,Cognition Disorders,Mental Disorders,Delirium, Dementia, Amnestic, Cognitive Disorders,Dyskinesias,Neurodegenerative Diseases,Central Nervous System Diseases,Huntington Disease,Brain and nervous system,Mental health and behavior,early-onset HD,expanded polyglutamine tract,mutable allele,rigid variant,St. Vitus dance,Sydenham's chorea,Westphal variant,Westphall variant,HTT,HTT gene,Huntington chorea,Huntington chronic progressive hereditary chorea,Huntington's chorea,Huntington's disease,National Library of Medicine,NLM,National Institutes of Health,NIH,health problem,health problems,disease,diseases,human genetics,gene,genes,genetic disease,genetic conditions