Parfitt, David A, Michael, Gregory J, Vermeulen, Esmeralda G M, Prodromou, Natalia V, Webb, Tom R, Gallo, Jean-Marc, Cheetham, Michael E, Nicoll, William S, Blatch, Gregory L, Chapple, J Paul. The ataxia protein sacsin is a functional co-chaperone that protects against polyglutamine-expanded ataxin-1. 2009.