1. Department of Chemistry, Pennsylvania State University, University Park, Pennsylvania 16802, United States
2. Division of Chemical Biology and Medicinal Chemistry, Eshelman School of Pharmacy, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
3. Department of Biochemistry and Biophysics, School of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
4. N.K. Koltsov Institute of Developmental Biology of Russian Academy of Sciences, Vavilova str. 26, Moscow 119334, Russia