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In primary Sertoli cells, the orphan nuclear receptor, steroidogenic factor 1 (SF-1), regulates the MIS gene by binding to a conserved upstream regulatory element. In heterologous (HeLa) cells, MIS gene activation by SF-1 requires removal of the SF-1 ligand-binding domain, implicating a Sertoli cell-specific ligand or cofactor. Finally, the sexually dimorphic expression of SF-1 during development coincides with MIS expression and müllerian duct regression. We propose that SF-1 regulates MIS in vivo and participates directly in the process of mammalian sex determination. 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