Anti-STN1 subunit of CST complex antibodies are used for the immunodetection of the protein encoded by the STN1 gene. In humans, the canonical protein has a reported length of 368 amino acid residues and a mass of 42.1 kDa. Its subcellular localization is in the nucleus. A member of the STN1 protein family, it is a known component of the CST complex proposed to act as a specialized replication factor promoting DNA replication under conditions of replication stress or natural replication barriers such as the telomere duplex. The gene encoding this protein is implicated in Cerebroretinal microangiopathy with calcifications and cysts. Other names for this target antigen include STN1, CST complex subunit, alpha accessory factor 44, oligonucleotide/oligosaccharide binding fold containing 1, and CST complex subunit STN1. Gene orthologs have been identified in the mouse, rat, bovine, zebrafish, chimpanzee and chicken species.