Nat. Cell Biol. 13, 1214–1223 (2011); published online 11 September 2011; corrected after print 15 November 2011

In the version of this article initially published online and in print, the first sentence in the Acknowledgements section was incorrect. The correct sentence is:

We thank E. Baehrecke for critical reading of the manuscript, T. Schlaeger and colleagues for assistance with H1-OGN and associated cell lines, the University of Massachusetts Medical School (UMMS) Flow Facility for assistance with MBd enrichment, P. Furcinitti of UMMS Digital Light Microscopy Core Facility for assistance with imaging, the UMMS DERC Morphology Core for assistance with immunohistochemitry, D. Guertin and C. Sparks for assistance with SMP preparation, S. Lyle and C. Powers for performing EM experiments and H-L. Liu for assistance with clone construction. This error has been corrected in the HTML and PDF versions of the article.