1. Drug
and Target Discovery, Department of Pharmacy and Pharmacology, University of Bath, Claverton Down, Bath, Somerset BA2 7AY, U. K.
2. Faculty
of Biochemistry and Molecular Medicine, Biocenter Oulu, University of Oulu, PO
Box 5400, 90014 Oulu, Finland
3. Department
of Biology and Biochemistry, University of Bath, Bath BA2 7AY, U. K.