1. Laboratory of Chinese Medicine Genetics, Chengdu University of Traditional Chinese Medicine, Chengdu 610072, China
2. Division of Biochemistry and Molecular Biology, Henan College of Traditional Chinese Medicine, Zhengzhou 450008, China
3. Institute of Molecular and Cell Biology, Singapore 138673, Singapore
4. Department of Mathematics, National University of Singapore, 2 Science Drive 2, Singapore 117543, Singapore