Normal sexual differentiation. SRY, sex determining region on Y chromosome; TDF, testis determining factor; AMH, anti-Müllerian hormone; T, testosterone; DHT, dihydrotestosterone; WT1, Wilms' tumour suppressor gene; SF1, steroidogenic factor 1; SOX9, SRY-like HMG-box; Wnt4, Wnt = a group of secreted signalling molecules that regulate cell to cell interactions during embryogenesis; DAX1, DSS-AHC critical region on the X chromosome.