[1] Department of Neuroscience,
[2] Karolinska Institute,undefined
[3] Doktorsringen 17,undefined
[4] S-17177 Stockholm,undefined
[5] Sweden Fax: +46-8-33-103968,undefined
[6] e-mail: Goran.Ornung@neuro.ki.se,undefined
[7] Institute of Basic Medical Sciences,undefined
[8] University of Oslo,undefined
[9] Oslo,undefined
[10] Norway,undefined