Anti-CSSG1 antibodies are used in antigen-specific immunodetection in biological samples. The target CSSG1 is a known alias name of the protein chromosome 21 open reading frame 91, encoded by the C21orf91 gene in humans. This 297-amino acid residue protein is reported to play a role in cortical progenitor cell proliferation and differentiation. In terms of tissue expression, it is notably expressed in the brain.