AMHR2 and persistent Mullerian duct syndrome: Our comparative analyses of callitrichines vs. Saimiri revealed multiple NSs in these genes, with significantly altered protein function as a consequence of three substitutions in AMH and two in AMHR2. The clinical condition of persistent Müllerian duct syndrome, in which males exhibit normal external genitalia but possess fallopian tubes and uteri, is associated with mutations in the coding regions for both AMH ligand and receptor genes [59, 60] in regions of exons in close proximity to NSs we identified in callitrichine primates.