Have signed the Informed Consent Form (ICF)

Aged 25 to 60 years, inclusive, at the time of signing the ICF

Confirmation of Huntington Disease (HD) gene expansion mutation carrier status

Confirmation of Total Functional Capacity (TFC) ≥9 and Total Motor Score (TMS) \>6 within 12 months prior to signing the ICF

Ability to tolerate blood draws

Frequency of Selected Single Nucleotide Polymorphisms in Huntington Disease Gene Expansion Carriers