[1] Univ Thessaloniki, Dept Gen Biol, Sch Med, GR-54006 Thessaloniki, Greece
[2] Univ Thessaloniki, Dept Pharmacol, Sch Med, GR-54006 Thessaloniki, Greece
[3] Mayo Clin, Dept Neurosci, Jacksonville, FL 32224 USA
[4] NIA, Neurogenet Lab, NIH, Bethesda, MD 20892 USA
[5] UCL, Reta Lila Weston Inst Neurol Studies, London WC2, England
[6] Inst Neurol, Dept Mol Pathogenesis, London WC2, England
[7] Mayo Clin, Dept Community Med, Rochester, MN 55055 USA
[8] Mayo Clin, Dept Neurol, Rochester, MN 55055 USA