About the Authors
Max Planck Institut für biophysikalische Chemie, Göttingen, Germany
DeveloGen, Göttingen, Germany
Developmental Biology Unit, European Molecular Biology Laboratory, Heidelberg, Germany
The authors have declared that no competing interests exist.
KE, MM, AH, AE, PR, SMC, HJ, and GV conceived and designed the experiments. NS, AM, KS, JM, SC, AH, GB, AE, PR, SF, OP, US, and GV performed the experiments. TS, TH, HRC, US, and GV analyzed the data. GV wrote the paper.