1 Sue and Bill Gross Stem Cell Research Center, Chao Family Comprehensive Cancer Center, Department of Biomedical Engineering and Department of Pharmaceutical Sciences, University of California, Irvine, USA.
2 Department of Molecular Therapeutics, The Scripps Research Institute, Jupiter, FL, USA.
3 Haematopoietic Stem Cell Laboratory Cancer Research UK, London Research Institute, Lincoln's Inn Fields Laboratories, London, UK.
4 Laboratory of Cell Biology and Advanced Cancer Therapies, Department of Medical and Surgical Sciences for Children & Adults, University Hospital of Modena and Reggio Emilia, Modena, Italy.
5 Section of Hematology, Stem Cell Research Laboratory and Cell Factory, Department of Medicine, University of Verona, Policlinico G.B. Rossi, P.le L.A., Italy.