Orphan receptor. Specific expression in peripheral nervous system, including nerve growth factor-dependent sensory and sympathetic neurons, as well as enteric neurons. Mostly restricted to cells of the nervous system. Expressed in NGF-dependent neurons of the PNS, but also found in subpopulations of CNS neurons, like spinal cord motoneurons, retinal ganglia cells and EGL cells of the cerebellum. Belongs to the G-protein coupled receptor 1 family.