GALR3 is a G protein-coupled receptor that functions as a receptor for the neuropeptide galanin 1 and the novel peptide spexin-1 2. The receptor is widely distributed across tissues with highest expression in the hypothalamus and pituitary 1, as well as testis, adrenal gland, and pancreas 3. GALR3 couples to G-protein signaling pathways, specifically activating inward rectifying potassium (GIRK) channels 1, and signals predominantly through inhibition of adenylate cyclase 3, distinguishing it from GALR2 which activates phospholipase C. In the atrial context, spexin-GALR2 (not GALR3) signaling reduces atrial fibrillation susceptibility by suppressing CREB phosphorylation and downstream potassium channel regulation 4. GALR3 exhibits disease relevance in colorectal cancer, where elevated GALR3 immunoexpression in cancer tissue correlates with improved patient prognosis and longer overall survival 5. Additionally, GALR3 genetic variation associates with alcoholism risk 6, and GALR3 expression changes occur in polycystic ovary syndrome 7. These findings suggest GALR3 mediates diverse physiological processes including feeding behavior, nociception, and reproductive function.