1. Biomedical
Research Center, National Institute on Aging, National Institutes of Health, 251 Bayview Boulevard, Suite 100, Baltimore, Maryland 21224, United States
2. Molecular
Targets Laboratory, Center for Cancer Research, National Cancer Institute, Frederick, Maryland 21702, United States
3. Section
of Botany, Carnegie Museum of Natural History, 4400 Forbes Avenue Pittsburgh, Pennsylvania 15213, United States
4. Key
Laboratory of the Ministry of Education in China on the Standardization
of Chinese Materia Medica, School of Pharmacy, Chengdu University of Traditional Chinese Medicine, Chengdu 611137, People’s Republic of China