[1
]Institute for Neurobiology, P.O. Box 1860, D-39008 Magdeburg, Germany
[2
]Institute of Biochemistry, Martin Luther University, D-06114 Halle, Germany
[3
]Institute of Biochemistry, Friedrich Schiller University, D-07743 Jena, Germany
[4
]Institute of Pathology, University of Tromsö, Norway