1 Gene Expression Laboratory, Salk Institute for Biological Studies, 10010 North Torrey Pines Road, La Jolla, 92037, California, USA.
2 Department of Bioengineering, University of California at San Diego, La Jolla, 92093, California, USA.
3 Department of Cell Biology, Scripps Research Institute, La Jolla, 92037, California, USA.
4 Center for Regenerative Medicine in Barcelona, Dr. Aiguader 88, Barcelona, 08003, Spain.
5 Gene Expression Laboratory, Salk Institute for Biological Studies, 10010 North Torrey Pines Road, La Jolla, 92037, California, USA. belmonte@salk.edu.
6 Center for Regenerative Medicine in Barcelona, Dr. Aiguader 88, Barcelona, 08003, Spain. belmonte@salk.edu.