1. The Wistar Institute, 3601 Spruce Street, Philadelphia, PA 19104 (USA), Fax: (+1) 215‐898‐7952 http://www.wistar.org/research_facilities/huang/research.htm
2. Department of Chemistry, North Carolina State University, Raleigh, NC 27695‐8204 (USA), Fax: (+1) 919‐515‐5079, http://www4.ncsu.edu/∼adeiter/
3. University of Pennsylvania School of Medicine (USA)