Anti-solute carrier family 51 subunit beta antibodies are used for the immunodetection of the protein encoded by the SLC51B gene. In humans, the canonical protein has a reported length of 128 amino acid residues and a mass of 14.3 kDa. Its subcellular localization is in the cell membrane. It is reported to be widely expressed with a high expression in ileum. A member of the OST-beta protein family, it is an important component of the Ost-alpha/Ost-beta complex, a heterodimer that acts as the intestinal basolateral transporter responsible for bile acid export from enterocytes into portal blood. The gene encoding this protein is implicated in Bile acid malabsorption. Other names for this target antigen include OST-beta, organic solute transporter beta subunit, solute carrier family 51 beta subunit, and organic solute transporter subunit beta. Gene orthologs have been identified in the mouse, rat, bovine, frog, chimpanzee and chicken species.