[1] Genentech Inc, Dept Tumor Biol & Angiogenesis, San Francisco, CA 94080 USA
[2] Genentech Inc, Dept Biostat, San Francisco, CA 94080 USA
[3] Genentech Inc, Dept Mol Biol, San Francisco, CA 94080 USA
[4] Genentech Inc, Dept Immunol, San Francisco, CA 94080 USA
[5] Genentech Inc, Dept Bioinformat, San Francisco, CA 94080 USA
[6] Genentech Inc, Dept Canc Signaling, San Francisco, CA 94080 USA
[7] Univ Hamburg Eppendorf, D-20246 Hamburg, Germany
[8] Definiens AG, D-80339 Munich, Germany
[9] Univ Calif San Francisco, Brain Tumor Res Ctr, San Francisco, CA 94143 USA