A, Human; B, C, mouse. A, Diagram showing variation in position of testes and uterus in human Persistent Müllerian Duct Syndrome. B, C. Images of male reproductive tract organs from control (B) and Amhr2-null (C) mice. Amh-null male mice have the same phenotype as Amhr2-null mice. Ep, epididymis; ft, fallopian tube; gb, gubernaculum; scr, scrotum; sv, seminal vesicle; t, testis; ut, uterus; vd, vas deferens. Diagram in A modified from Hutson, Thorup, & Beasley, 2016.