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Accumulation of E2F-p107 and E2F-pRB DNA binding complexes occurred after herpes simplex virus infection of U2-OS cells. Accumulation of E2F-p107 also occurred by 4 h p.i. in C33 cells. This corresponded to a time when host DNA synthesis was reduced by 50%, and lagged by ≥1 h, the onset of viral DNA synthesis. To determine the basis for increased nuclear E2F complexes, we investigated the effects...