[1] Stanford Univ, Sch Med, Dept Biol Struct, Stanford, CA 94305 USA
[2] Mem Sloan Kettering Canc Ctr, Program Mol Biol, New York, NY 10021 USA
[3] Harvard Univ, Sch Med, Dept Genet, Boston, MA 02115 USA
[4] Univ Utah, Sch Med, Huntsman Canc Inst, Salt Lake City, UT 84108 USA
[5] Univ Utah, Sch Med, Dept Oncol Sci, Salt Lake City, UT 84108 USA