Vol. 199 No. 4, November 12, 2012. Pages 685–698.

The authors wish to acknowledge additional sources of support by adding a second author affiliation. The additional affiliation, along with the list of authors, appears below.

Arnab Sen,1,2 Zsanett Nagy-Zsvér-Vadas,1 and Michael P. Krahn1,2

1Molecular and Cellular Anatomy, University of Regensburg, 93053 Regensburg, Germany

2Stem Cell Biology, Department of Anatomy and Cell Biology, University of Göttingen, 37077 Göttingen, Germany

The authors of this paper declare that they have no conflicts of interest.

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