[1] Dublin City Univ, Natl Inst Cellular Biotechnol, Dublin 9, Ireland
[2] Univ Oxford, Human Epidermal Growth Factor Grp, Oxford OX1 2JD, England
[3] Univ Oxford, Weatherall Inst Mol Med, Dept Oncol, Growth Factor Grp, Oxford OX1 2JD, England
[4] St Vincents Univ Hosp, Clin Res Ctr, Dublin 4, Ireland
[5] Univ Coll Dublin, UCD Sch Med & Med Sci, Conway Inst, Dublin 2, Ireland
[6] Univ Calif Los Angeles, David Geffen Sch Med, Dept Med, Div Hematol Oncol, Los Angeles, CA 90095 USA
[7] Oxford Univ Hosp, Dept Cellular Pathol, Oxford, England
[8] Oxford Biomed Res Ctr, Oxford, England