1. Genome Biology Unit, European Molecular Biology Laboratory (EMBL), Heidelberg, Germany.
2. Cell Biology and Biophysics Unit, EMBL, Heidelberg, Germany.
3. Flow Cytometry Core Facility, EMBL, Heidelberg, Germany.
4. BD Biosciences, San Jose, CA, USA.
5. Advanced Light Microscopy Core Facility, EMBL, Heidelberg, Germany.
6. Department of Genetics, Stanford University School of Medicine, Stanford, CA, USA.
7. Stanford Genome Technology Center, Palo Alto, CA, USA.