Nature 459, 992–995 (2009); doi: 10.1038/nature08027

Recently, it has come to our attention that in the left panel of Fig. 2b of this Letter, the lanes labelled S2S4 and S6S17 were duplicated. We have reviewed the original data. It seems likely that a duplicated part of the blot was placed over lane S6S17 to aid alignment of molecular mass markers and inadvertently left there. We have now removed the duplicated lane and show the whole western blot (Fig. 1). Our conclusions are unaffected.

Figure 1: This is the corrected left panel of Fig. 2b.
figure 1

The right panel showing the Coomassie staining is not shown.

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