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Attempted complementation of mutants with deletions in the HCV-1b 5′UTR. Different HCV-1b 5′UTR deletion mutants either were transfected into vTF7-3-infected cells alone (black bars) or were cotransfected with pHCV1bS (hatched bars) or pHCV1bCAT (white bars) DNA. Relative IRES activity was calculated as described in the legend to Fig. 3.
