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Plasmids used in this study. They are described in Materials and Methods. The restriction sites used for cloning are indicated. The two stop codons in the orf-x reading frame of pCMV2JS21Δorfx are shown as vertical bars underlined by asterisks. The broken lines in pCMV3JS21ΔGP and pCMV3JS21ΔGPΔStuI indicate deletions.
