1. Division of Biochemistry, Department of Medical Biochemistry and Biophysics, Karolinska Institutet, SE-17165 Stockholm, Sweden.
2. Max Planck Institute for Evolutionary Anthropology, Deutscher Platz 6, D-04103 Leipzig, Germany.
3. Okinawa Institute of Science and Technology, Onna-son, Okinawa 904-0495, Japan.
4. Department of Neuroscience, Karolinska Institutet, SE-17165 Stockholm, Sweden.