[1] CHESTER BEATTY LABS,INST CANC RES,LEUKAEMIA RES FUND CTR,FULHAM RD,LONDON SW3 6JB,ENGLAND
[2] INST CHILD HLTH,DEPT HAEMATOL & ONCOL,LONDON WC1N 1EH,ENGLAND
[3] INST CHILD HLTH,IMPERIAL CANC RES FUND,LONDON WC1N 1EH,ENGLAND
[4] WASHINGTON UNIV,HOWARD HUGHES MED INST,ST LOUIS,MO 63130