HeLa cell monolayer cultures were maintained in Dulbecco's modified minimum essential medium (DMEM) supplemented with 10% (v/v) fetal bovine serum (FBS), penicillin and streptomycin in a humidified atmosphere containing 5% CO2 at 37 °C. Subconfluent cells were infected with wild-type human Adenovirus, Type 5 (Ad5 wildtype, ATCC, catalog No. VR-1516) at a multiplicity of infection of 120 infection units (IFU) per cell (1000 viral particles (VP)/cell). Briefly, cells were washed once with DMEM supplemented with 2% (v/v) FBS and inoculated with virus in DMEM with 2% FBS. During the incubation for 1 h cells were agitated four to five times. Afterwards, the medium was removed and replaced by fresh medium supplemented with 10% serum. Cells were incubated at 37 °C until the time for fixation and processing for immunofluorescence.