About the Authors
- Hans B Sieburg, Giulio Cattarossi, Christa E. Muller-Sieburg
- Stem Cell and Regenerative Medicine Program, The Sanford-Burnham Medical Research Institute, La Jolla, California, United States of America
The authors have declared that no competing interests exist.
Conceived and designed the experiments: CEMS. Performed the experiments: GC. Analyzed the data: HBS. Wrote the paper: HBS CEMS.