Seems to play a role in testicular function. May be a trophic hormone with a role in testicular descent in fetal life. Is a ligand for LGR8 receptor. Heterodimer of a B chain and an A chain linked by two disulfide bonds. Expressed in prenatal and postnatal Leydig cells. Found as well in the corpus luteum, trophoblast, fetal membranes and breast. The disease may be caused by variants affecting the gene represented in this entry. Belongs to the insulin family.