1. Anti-Cancer Drug Laboratory, Division of Biology, Kansas State University, Ackert Hall, Manhattan, KS 66506-4901
2. Institute of Wood Research, Michigan Technological University, Houghton, MI 49931-1295
3. Silva S.r.l., 12080 San Michele Mondovi (Cuneo), Italy
4. Southern Forest Experiment Station, U.S. Department of Agriculture, Forest Service, Pineville, LA 71360-5500
5. Laboratoire de Chimie Biologique, Institut National de la Recherche Agronomique, Institut National Agronomique, Paris-Grignon, 78850 Thiverval-Grignon, France