Anti-ust3 antibodies enable researchers to detect and measure the ust3 antigen in biological samples. This target is a reported synonym of the SLC22A9 gene, which encodes solute carrier family 22 member 9. This protein is known to function in the transport of ions, among other biological roles. The human version of ust3 has a canonical amino acid length of 553 residues and a protein mass of 62.2 kilodaltons, although 2 isoforms have been identified. It is reported to be localized in the cell membrane of cells. ust3 is a member of the Organic cation transporter (TC 2.A.1.19) protein family.