Department of Cell and Molecular Biology, Uppsala University, Husargatan 3, Uppsala, Sweden. jan.komorowski@lcb.uu.se.|Department of Cell and Molecular Biology, Uppsala University, Husargatan 3, Uppsala, Sweden. jan.komorowski@lcb.uu.se.|Department of Cell and Molecular Biology, Uppsala University, Husargatan 3, Uppsala, Sweden. jan.komorowski@lcb.uu.se.|Department of Cell and Molecular Biology, Uppsala University, Husargatan 3, Uppsala, Sweden. jan.komorowski@lcb.uu.se.