Anti-ARSACS antibodies are protein reagents that detect specific antigens. The ARSACS antigen is another term for the human protein sacsin molecular chaperone, encoded by the SACS gene. The protein is known to function in protein folding, among other biological roles. Canonically, it has an amino acid length of 4579 residues and a mass of 521.1 kilodaltons. Its subcellular localization is in the cytoplasm and it is reported to be highly expressed in the central nervous system.