1. Department of Chemistry, University of Waterloo, 200 University Ave. W., Waterloo, ON N2L 3G1, Canada.
2. Institute for Cell and Molecular Biosciences, University of Newcastle, Newcastle-upon-Tyne, UK.
3. Institute of Zoology, University of Mainz, 55099 Mainz, Germany.
4. Health Sector, Biotechnology Research Institute, National Research Council of Canada, 6100 Royalmount Avenue, Montreal, QC H4P 2R2, Canada.