The AMHR2 gene encodes the anti-Müllerian hormone (AMH) receptor type 2 that is involved in male sex differentiation. The AMH receptor type 2 is found on the surface of Müllerian duct cells. These cells are found in both male and female fetuses, and they are the precursor to the female reproductive organs. AMHR2 is an essential factor for the regression of the Müllerian duct in males. During development of male fetuses, AMH and testosterone are produced in the testes by different cells and have different effects. Testosterone promotes the development of male genitalia while the AMH protein binds to the AMH receptor type 2, which signals apoptosis of the Müllerian duct cells. As a result, the Müllerian duct regresses in males. Defects in the AMH receptor type 2 lead to the persistent Müllerian duct syndrome, a rare form of male pseudohermaphroditism characterized by a failure of Muellerian duct regression and becomes a uterus and fallopian tubes in otherwise normal males.