[1] Univ Pittsburgh, Pittsburgh, PA 15260 USA
[2] Chinese Acad Sci, Shanghai Inst Biochem & Cell Biol, Beijing, Peoples R China
[3] Stanford Univ, Sch Med, Stanford, CA 94305 USA
[4] Univ Texas MD Anderson Canc Ctr, Houston, TX 77030 USA
[5] St Jude Childrens Res Hosp, Memphis, TN USA
[6] Univ Lausanne, Lausanne, Switzerland
[7] Tech Univ Munich, Munich, Germany