1. MRC Centre for Regenerative Medicine, John Hughes Bennett Laboratory, Queens Medical Research Institute, Edinburgh, United Kingdom.
2. Cell Therapy Group, Scottish National Blood Transfusion Service, Chancellors Building, Edinburgh, United Kingdom.
3. Laboratory of Stem Cell Physiology, III. Medizinische Klinik und Poliklinik, Klinikum Rechts der Isar, Technische Universitat Munchen, Munchen, Germany.