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Recombinant VSV-influenza virus A/WSN constructs. A schematic representation of recombinant viruses indicating gene order is shown 3′ to 5′ on the negative-strand genomic RNA. Each intergenic region contains a transcriptional STOP/START signal recognized by the VSV polymerase (32). Restriction enzyme sequences used for constructing cDNAs of the recombinants are also shown.
