Anti-CST antibodies enable researchers to detect and measure the CST antigen in biological samples. This target is a reported synonym of the GAL3ST1 gene, which encodes galactose-3-O-sulfotransferase 1. This protein is known to function in the metabolism of lipids and spermatogenesis, among other biological roles. The human version of CST has a canonical amino acid length of 423 residues and a protein mass of 48.8 kilodaltons. It is reported to be localized in the Golgi of cells and notably expressed in the stomach, small intestine, prostate, and kidney. CST is a member of the Galactose-3-O-sulfotransferase protein family.