Anti-SK2 antibodies enable researchers to detect and measure the SK2 antigen in biological samples. This target is a reported synonym of the PAPSS2 gene, which encodes 3'-phosphoadenosine 5'-phosphosulfate synthase 2. This protein is known to function in bone development and protein phosphorylation, among other biological roles. The human version of SK2 has a canonical amino acid length of 614 residues and a protein mass of 69.5 kilodaltons, although 2 isoforms have been identified. It is reported to be notably expressed in many tissues, such as the adrenal gland and cartilage. SK2 is a member of the APS kinase protein family; Sulfate adenylyltransferase protein family.