Nature 476, 101–104 (2011)

In Fig. 3 of this Letter, the label above Fig. 3c should have read “Mutant gonad” not “Mutant gonad (TX)”. In the legend to Fig. 3i “XY Dmrt1KO gonads” should have read “XY SCDmrt1KO gonads”. These errors were corrected online on 3 August 2011.