1. Swiss Institute
of Bioinformatics and Biozentrum University of Basel, Klingelbergstrasse 50/70, CH-4056 Basel, Switzerland
2. Department
of Chemistry and Biochemistry and Centre for Research
in Molecular Modeling (CERMM), Concordia University, 7141 Sherbrooke Street West, Montréal, Québec H4B 1R6, Canada