1. Department travellers of Pathology, Stanford School of Medicine, Stanford, CA 94305, USA
2. Department of Dermatology, Stanford School of Medicine, Stanford, CA 94305, USA
3. Program in Cancer Biology, Stanford School of Medicine, Stanford, CA 94305, USA
4. Institute for Clinical Genetics, TU Dresden, Dresden, Germany
5. Department of Genetics, Stanford School of Medicine, Stanford, CA 94305, USA
6. School of Life Sciences, Peking University, Beijing 100871, China