From the ‡Department of Biosciences, Karolinska Institute, 14157 Stockholm, Sweden, the ¶Department of Biochemistry and Pharmacy, Åbo Akademi University, 20521 Turku, Finland, the Department of Virology, Haartman Institute, University of Helsinki, 00014 Helsinki, Finland, the **Department of Cell Biology, University of Jyväskylä, 40351 Jyväskylä, Finland, and the ‡‡Department of Medical Microbi...