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Steroidogenic factor 1 (SF-1), a NR5 Fushi Tarazu-Like Receptor, has been shown to affect sexual differentiation, steroid metabolism, and neural development. SF-1 binds as a monomer and regulates all steroidogenic p450 genes, Mullerian inhibiting substance, the gonadotrophins, the ACTH receptor, oxytocin, nuclear receptor DAX-1, and several other genes. Four alternatively spliced isoforms of SF-1 have been isolated in mice, and they differ at the N and C termini but are identical in the DNA-binding domain. SF-1 expression has been documented in human brain, adrenal, spleen, liver, heart, ovary, testis, and placenta. ESTs have been isolated from human tissue libraries, including cancerous adrenal and normal lung and testis.