1. Cutaneous
Biology Research Center, Massachusetts General Hospital and Harvard Medical School, Charlestown, Massachusetts
02129, United States
2. High
Magnetic Field laboratory, Chinese Academy of Sciences, P.O. Box 1110, Hefei,
Anhui, 230031, P. R. China
3. Structural Genomics Consortium, University of Oxford, Oxford OX3 7DQ, U.K.