1. Molecular and Cell Biology Laboratory, Salk Institute for Biological Studies, La Jolla, United States
2. Laboratory of Genetics, Salk Institute for Biological Studies, La Jolla, United States
3. Gene Expression Laboratory, Salk Institute for Biological Studies, La Jolla, United States
4. Stem Cell Core, Salk Institute for Biological Studies, La Jolla, United States
5. Howard Hughes Medical Institute, Salk Institute for Biological Studies, La Jolla, United States