Receptor for the hormone galanin (PubMed:24517231). Receptor for the hormones spexin-1 and spexin-2 (PubMed:24517231, PubMed:31474838). Expressed in neurons in the ventral area of the interpeduncular nucleus (IPN) where expression often overlaps with spx1. In embryos, widely expressed in nerve cells innervating the central nervous system (CNS) in regions including the olfactory bulb, midbrain tegmentum, preoptic region, dorsal thalamus, posterior tuberculum, postoptic commissure, hindbrain, and lateral margin of the spinal cord (PubMed:27315774). In the spinal cord, expressed in various neuronal cell types throughout the dorsoventral axis, including motor neurons and interneurons (PubMed:27315774). In the postoptic commissure, anterior commissure, hypothalamus and pituitary gland, expression overlaps with gal (PubMed:27315774). In larvae, expressed in nerve cells in the dorsal spinal cord where expression often overlaps with spx1 (PubMed:30903017). Belongs to the G-protein coupled receptor 1 family.