1 1State Key Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences, Peking Union Medical College, Tsinghua University, Beijing, 100005 People's Republic of China.
2 2Institute of Basic Theory for Chinese Medicine, China Academy of Chinese Medical Sciences, Beijing, 100700 People's Republic of China.
3 3Department of Engineering, Aarhus University, 8000 Aarhus, Denmark.