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. 1999 Jan;73(1):307–315. doi: 10.1128/jvi.73.1.307-315.1999

FIG. 1.

FIG. 1

Diagram of the infectivity assay. Details of the assay are described in Materials and Methods. Plasmids are represented by circles with an arrow to highlight the promoter for T7 RNA polymerase (T7 pro). vTF7-3, is a recombinant vaccinia virus expressing T7 RNA polymerase.

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