Fig. 3. Effects of IFN-{alpha} on IL-2-mediated up-regulation of cell cycle proteins. Immunoblot analysis of cyclin D3 and cyclin E (A) and Cdk2 and Cdk6 (B) expression in quiescent (Day 0), PHA-treated (Day 3), IL-2-treated (Days 4–6), and IL-2/IFN-{alpha}-treated (Days 4–6) cells.