Computational Biology Program, Sloan Kettering Institute, New York, NY 1275, USA.|Computational Biology Program, Sloan Kettering Institute, New York, NY 1275, USA.|Max Delbrück Center for Molecular Medicine, 13125 Berlin, Germany.|Computational Biology Program, Sloan Kettering Institute, New York, NY 1275, USA.|Computational Biology Program, Sloan Kettering Institute, New York, NY 1275, USA.|Cancer Biology Program, Sloan Kettering Institute, New York, NY, USA.|Cancer Biology Program, Sloan Kettering Institute, New York, NY, USA.|Computational Biology Program, Sloan Kettering Institute, New York, NY 1275, USA.