1. Faculty of Life Sciences (M.P.G., R.J.B.), University of Manchester, Manchester M13 9PT, United Kingdom
2. Department of Animal Physiology (G.F.), Radboud University Nijmegen, Toernooiveld 1, 6525 ED Nijmegen, The Netherlands
3. Department of Physiology and Pharmacology (G.F.W.), Schulich School of Medicine and Dentistry, University of Western Ontario, London, Ontario, Canada N6A 5C1