Binds to bile acids and is involved in enterohepatic bile acid metabolism. Required for efficient apical to basolateral transport of conjugated bile acids in ileal enterocytes (PubMed:23251388). Stimulates gastric acid and pepsinogen secretion (By similarity). Expressed in ovary granulosa and luteal cells. Forms a beta-barrel structure that accommodates hydrophobic ligands in its interior. Can bind at least two ligands per molecule, however, the stoichiometry is debated. Belongs to the calycin superfamily. Fatty-acid binding protein (FABP) family.