Endocrine hormone of the central and peripheral nervous systems that binds and activates the G protein-coupled receptors GALR1, GALR2, and GALR3. This small neuropeptide may regulate diverse physiologic functions including contraction of smooth muscle of the gastrointestinal and genitourinary tract, growth hormone and insulin release and adrenal secretion. {ECO:0000269|PubMed:1370155, ECO:0000269|PubMed:1722333, ECO:0000269|PubMed:25691535}. This is the function of Ensembl gene identifier ENSG00000069482 (GAL, galanin and GMAP prepropeptide).