'S-antigen; retina and pineal gland (arrestin)' recombinant proteins are available from various sources. Apart from humans, orthologs of this protein are also expressed in: mouse, rat, zebrafish, chimpanzee, guinea pig. SAG and 'S-antigen visual arrestin' are the HGNC approved human gene symbol and full name. The Uniprot entry ID is P10523. Provided sequence information depicts S-antigen; retina and pineal gland (arrestin) as being 405 residues long with a mass of 45.2 kDa. This protein has been annotated a gene ontology function in: 'regulation of rhodopsin mediated signaling pathway'.