Nature 463, 545–548 (2010); doi:10.1038/nature08702

In this Letter, Fig. 2h was inadvertently a duplicate of Fig. 2m, owing to figure reformatting after the manuscript had been accepted. The correct image for the Upd//+ experiment in Fig. 2h is shown in Fig. 1 of this Corrigendum. This error does not affect the results or conclusions of the Letter, and we apologize for the mistake. The original Letter online has not been corrected.

Figure 1
figure 1

This is the corrected Fig. 2h of the original Letter.

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