[1] Carnegie Mellon Univ, Sch Comp Sci, Dept Comp Sci, Pittsburgh, PA 15213 USA
[2] Carnegie Mellon Univ, Lane Ctr Computat Biol, Pittsburgh, PA 15213 USA
[3] Hebrew Univ Jerusalem, Sch Med, Dept Mol Biol, IL-91120 Jerusalem, Israel
[4] Hebrew Univ Jerusalem, Alexander Silberman Inst Life Sci, Dept Genet, IL-91904 Jerusalem, Israel
[5] German Canc Res Ctr, Dept Theoret Bioinformat, D-69120 Heidelberg, Germany
[6] Heidelberg Univ, Inst Pharm & Mol Biotechnol, Dept Bioinformat & Funct Genom, D-69115 Heidelberg, Germany
[7] NYU, Sch Med, Dept Pathol, New York, NY 10016 USA
[8] NYU, Sch Med, Newyork Univ Canc Inst, New York, NY 10016 USA