Receptor that may have an important role in the development of the sensory nervous system. Weak expression was first detected at 20 hours post-fertilization (hpf) in the ventral diencephalon. At 24-26 hpf, expression is prominent in the prospective fore-, mid- and hindbrain including the ventral part of the epiphysis. Expression is not detected outside of the central nervous system (CNS) at this stage. At 48 hpf and 72 hpf, expression is detected in the posterior dorsal tegmentum, the mid-hindbrain boundary and in the lower rhombic lip. Expression in the eye is associated with the optic nerve. Outside the CNS, expressed in the anteriorpronephric duct. Belongs to the G-protein coupled receptor 2 family. Adhesion G-protein coupled receptor (ADGR) subfamily.