[1] GENENTECH INC, DEPT PROC SCI, SAN FRANCISCO, CA 94080 USA
[2] GENENTECH INC, DEPT MED & ANALYT CHEM, SAN FRANCISCO, CA 94080 USA
[3] HARVARD UNIV, NEW ENGLAND DEACONESS HOSP, SCH MED, DEPT HEMATOL & ONCOL, BOSTON, MA 02215 USA
[4] CHESTER BEATTY LABS, INST CANC RES, LONDON SW3 6JB, ENGLAND
[5] SW FDN BIOMED RES, SAN ANTONIO, TX 78284 USA