FIG. 3.

Virus titers on serum-starved mouse cell lines. Monolayers of mouse 3T6 cells or secondary cells derived from embryos of Rb+/+, Rb+/−, or Rb−/− knockout mice were serum starved for 3 days prior to infection. Virus titers were determined on day 3 p.i. for wt and mutant MAV-1. The cell type is given in the upper left corner of each panel. Two independent Rb+/− cell strains and two independent Rb−/− cell strains were tested.