About the Authors
Institute of Developmental Genetics, Helmholtz Zentrum München–German Research Center for Environmental Health, Neuherberg, Germany
Department of Neurobiology, Broad Center of Regenerative Medicine and Stem Cell Research, David Geffen School of Medicine at UCLA, Los Angeles, California, United States of America
The authors have declared that no competing interests exist.
The author(s) have made the following declarations about their contributions: Conceived and designed the experiments: RH HS ABH. Performed the experiments: RH HS EB. Analyzed the data: RH HS EB ABH. Contributed reagents/materials/analysis tools: BGN. Wrote the paper: ABH.