Citation: Sx. Tang et al., Alterations to both the primary and predicted secondary structure of stem-loop IIIc of the hepatitis C virus ib 5 ' untranslated region (5 ' UTR) lead to mutants severely defective in translation which cannot be complementedin trans by the wild-type 5 ' UTR sequence, J VIROLOGY, 73(3), 1999, pp. 2359-2364