Orphan receptor with constitutive G(s) signaling activity that activate cyclic AMP. Promotes neurite outgrowth and blocks myelin inhibition in neurons (By similarity). Detected in the intracellular compartments. It is currently unclear whether this is a cell surface or intracellular receptor. Belongs to the G-protein coupled receptor 1 family. Was originally (PubMed:12220620) thought to be a receptor for sphingosine 1-phosphate. It has been demonstrated that it is not the case (PubMed:19286662).