Affiliation: | ‡Max Delbrueck Center for Molecular Medicine, D-13125 Berlin, the §Department of Biology/Biophysics, Humboldt University Berlin, D-10115 Berlin, the ¶Department of Molecular Biology, Max Planck Institute for Infection Biology, D-10117 Berlin, and the Department of Biology, Technische Universität Darmstadt, D-64287 Darmstadt, Germany |