[1] Univ Gottingen, European Neurosci Inst, Cluster Excellence Nanoscale Microscopy & Mol Phy, Med Ctr,Dept Neuro & Sensory Physiol, D-37073 Gottingen, Germany
[2] Int Max Planck Res Sch Neurosci, D-37077 Gottingen, Germany
[3] Max Planck Inst Biophys Chem, Bioanalyt Mass Spectrometry Grp, D-37077 Gottingen, Germany
[4] Univ Med Ctr Gottingen, Dept Clin Chem, D-37075 Gottingen, Germany
[5] Int Max Planck Res Sch Mol Biol, D-37077 Gottingen, Germany
[6] Leibniz Inst Mol Pharmacol, Dept Mol Pharmacol & Cell Biol, D-13125 Berlin, Germany