1 Gene Expression Laboratory, Salk lnstitute for Biological Studies, La Jolla, CA 92037, USA; Laboratory for Stem Cell Biology, RIKEN Center for Developmental Biology, Kobe, Japan; Foundation for Biomedical Research and Innovation, Kobe, Japan; Division of Regenerative Medicine, Center for Molecular Medicine, Jichi Medical University, Tochigi, Japan. Electronic address: smasuda@salk.edu.
2 Center of Regenerative Medicine in Barcelona, Barcelona, Spain.
3 Gene Expression Laboratory, Salk lnstitute for Biological Studies, La Jolla, CA 92037, USA.
4 Gene Expression Laboratory, Salk lnstitute for Biological Studies, La Jolla, CA 92037, USA; Center of Regenerative Medicine in Barcelona, Barcelona, Spain.