1. Department of Chemistry, Umeå University, SE-901 87 Umeå, Sweden, Department of Zoology, University of Gothenburg, Box 463, SE-405 30 Gothenburg, Sweden, CRBN Defence and Security, Swedish Defence Research Agency, SE-901 82 Umeå, Sweden, and Department of Neuroscience and Physiology, the Sahlgrenska Academy at the University of Gothenburg, SE-405 30 Gothenburg, Sweden