Affiliation: | (1) IRBV, Department of Biological Sciences, University of Montreal, 4101 Sherbrooke Street E., H1X 2B2 Montreal, Quebec, Canada;(2) Present address: Department of Chemistry, Massachusetts Institute of Technology, 02139 Cambridge, MA, USA;(3) Present address: Department of Biology, Texas A & M University, 77843-3258 College Station, TX |