[1] Univ Manchester, Canc Res UK Stem Cell Biol Grp, Inst Canc Res, Manchester M20 4BX, Lancs, England
[2] Univ Manchester, Canc Res UK Stem Cell Hematopoiesis Grp, Paterson Inst Canc Res, Manchester M20 4BX, Lancs, England
[3] Univ Porto, Grad Program Areas Basic & Appl Biol GABBA, P-4100 Oporto, Portugal