1. Sanford Children's Health Research Center, Burnham Institute for Medical Research, La Jolla, CA 92037, USA.
2. Center for Regenerative Medicine and Skeletal Development, Department of Orthopaedic Surgery and University of Connecticut Stem Cell Institute,University of Connecticut Health Center, Farmington, CT 06030, USA.
3. Basic Research Laboratory, Kanebo Cosmetics, Odawara 250-0002, Japan.
4. Department of Cell Biology and Anatomy, Medical University of South Carolina,Charleston, SC 29425, USA.
5. Department of Social and Environmental Medicine, Graduate School of Medicine,Osaka University, Osaka 565-0871, Japan.