1. Evolutionary Biology Centre, Comparative Physiology, Uppsala University, Norbyvägen 18A, SE-752 36 Uppsala, Sweden
2. Department of Neuroscience, Physiology Unit, Biomedical Centre (BMC), Uppsala University, Box 572, SE-751 23 Uppsala, Sweden
3. Department of Food Science, Swedish University of Agricultural Sciences, PO Box 7051, SE-750 07 Uppsala, Sweden
4. School of Life Sciences, Biomedicine, University of Skövde, Box 408, SE-541 28 Skövde, Sweden