Receptor for bile acid. Bile-acid binding induces its internalization, activation of extracellular signal-regulated kinase and intracellular cAMP production. May be involved in the suppression of macrophage functions by bile acids. Involved in bile acid promoted GLP1R secretion (By similarity). Expressed at high level in spleen. Expressed at lower level in thymus, heart, lung, liver, kidney, ileum, blood and adherent alveolar macrophage cells. Belongs to the G-protein coupled receptor 1 family.