1. Division of Molecular Neurobiology, Department of Medical Biochemistry and Biophysics, Karolinska Institutet, S-17177 Stockholm, Sweden.
2. School of Medical Sciences, Institute of Medical Sciences, University of Aberdeen, Aberdeen Scotland AB25 2ZD, UK.
3. Department of Neurobiology, Kavli Institute for Neuroscience, Yale University School of Medicine, New Haven, CT 06510, USA.
4. Department of Neuroscience, Karolinska Institutet, S-17177 Stockholm, Sweden.
5. Laboratory of Cerebral Cortex Research, Institute of Experimental Medicine, Hungarian Academy of Sciences, H-1083 Budapest, Hungary.