Ready-to-use ELISA kits are available for the detection of ARSACS, an alias of the protein, sacsin molecular chaperone. The official gene symbol is SACS. The protein, with a mass of 521.1 kDa and length of 4579 residues, is reported to be cytoplasmic, nuclear and mitochondrial. It may be known by other names, including: PPP1R138, DNAJC29, spastic ataxia of Charlevoix-Saguenay (sacsin), protein phosphatase 1 regulatory subunit 138, dnaJ homolog subfamily C member 29, and sacsin.