Fig. (3) Titers of hexon-modified virus Ad5HVR7epB and non-modified virus Ad5-empty. Monolayers of HEK 293 cells cultured in 6-well plates were infected with the viruses. At different times post-infection, the cells and culture media were harvested, freeze-thawed and the viruses were titrated on HEK 293 cells. Values are expressed as the mean and standard deviation of two independent experiments.