Anti-C2orf61 antibodies enable researchers to detect and measure the C2orf61 antigen in biological samples. This target is a reported synonym of the STPG4 gene, which encodes sperm-tail PG-rich repeat containing 4. This protein is known to function in chromatin organization, among other biological roles. The human version of C2orf61 has a canonical amino acid length of 248 residues and a protein mass of 27.8 kilodaltons, although 2 isoforms have been identified. It is reported to be localized in the nucleus and cytoplasm of cells and notably expressed in the testis.