1. Division of Regenerative Medicine, Department of Medicine, University of California, San Diego, San Diego, CA 92037, USA.
2. Department of Pathology, Case Western Reserve University, Cleveland, OH 44106, USA.
3. Department of Molecular Medicine, Cleveland Clinic Lerner College of Medicine of Case Western Reserve University, Cleveland, OH 44106, USA.
4. Department of Pathology, Massachusetts General Hospital, Boston, MA 02114, USA.
5. University of Pittsburgh Medical Center Hillman Cancer Center, Pittsburgh, PA 15232, USA.
6. Tumor Initiation and Maintenance Program, NCI-Designated Cancer Center, Sanford Burnham Prebys Medical Discovery Institute, La Jolla, CA 92037, USA.
7. Department of Cancer Biology, Cleveland Clinic Lerner Research Institute, Cleveland, OH 44106, USA.