Anti-CT109 antibodies enable researchers to detect and measure the CT109 antigen in biological samples. This target is a reported synonym of the CCDC62 gene, which encodes coiled-coil domain containing 62. This protein is known to function in the regulation of transcription and spermatid development, among other biological roles. The human version of CT109 has a canonical amino acid length of 684 residues and a protein mass of 77.7 kilodaltons, although 3 isoforms have been identified. It is reported to be localized in the nucleus, cytoplasmic vesicles, and cytoplasm of cells and notably expressed in the testis.