Department of Cell and Molecular Biology, BMC, Uppsala University, 75124 Uppsala, Sweden. johan.hattne@embl-hamburg.de|Department of Cell and Molecular Biology, BMC, Uppsala University, 75124 Uppsala, Sweden. johan.hattne@embl-hamburg.de|Department of Cell and Molecular Biology, BMC, Uppsala University, 75124 Uppsala, Sweden. johan.hattne@embl-hamburg.de