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Correspondence to: scottjdw@uw.edu
Correction to: The EMBO Journal (2012) 31, 3991–4004. doi:10.1038/emboj.2012.244
Since the publication of this paper, the authors have realised that they should have included a further acknowledgement. They would like to acknowledge their grant number DK54441 from the National Institutes of Health.
The authors apologise for any inconvenience caused.
