Department of Cell Biology, Christian-Albrechts-University Kiel, Schittenhelmstrasse 12, Kiel, Germany. e.philipp@ikmb.uni-kiel.de|Department of Cell Biology, Christian-Albrechts-University Kiel, Schittenhelmstrasse 12, Kiel, Germany. e.philipp@ikmb.uni-kiel.de|Department of Cell Biology, Christian-Albrechts-University Kiel, Schittenhelmstrasse 12, Kiel, Germany. e.philipp@ikmb.uni-kiel.de|Department of Cell Biology, Christian-Albrechts-University Kiel, Schittenhelmstrasse 12, Kiel, Germany. e.philipp@ikmb.uni-kiel.de|Department of Cell Biology, Christian-Albrechts-University Kiel, Schittenhelmstrasse 12, Kiel, Germany. e.philipp@ikmb.uni-kiel.de|Department of Cell Biology, Christian-Albrechts-University Kiel, Schittenhelmstrasse 12, Kiel, Germany. e.philipp@ikmb.uni-kiel.de