1. From the Microbiology and Tumor Biology Center (R.C., A.E., Y.C.) Karolinska Institutet, Stockholm, Sweden; Molecular/Cancer Biology Laboratory and Ludwig Institute for Cancer Research (H.K., K.A.), Haartman Institute and Helsinki University Central Hospital, Biomedicum Helsinki, University of Helsinki, Helsinki, Finland; and Department of Cell and Molecular Biology (J.T.), Karolinska Institutet, Stockholm, Sweden.