1. Sensory Neuroscience Research Group, School of Pharmacy and Biomolecular Sciences, University of Brighton, Huxley Building, Brighton BN2 4GJ, UK.
2. Brighton and Sussex Medical School, University of Sussex, Brighton BN1 9PX, UK.
3. Laboratory of Endocrinology and Receptor Biology, NIDDK, National Institutes of Health, 10 Center Drive, Bethesda, MD 20892, USA.