Anti-C9orf173 antibodies enable researchers to detect and measure the C9orf173 antigen in biological samples. This target is a reported synonym of the STPG3 gene, which encodes sperm-tail PG-rich repeat containing 3. The human version of C9orf173 has a canonical amino acid length of 386 residues and a protein mass of 42.5 kilodaltons, although 4 isoforms have been identified.