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Structures of the transcriptional start sites of the duplex AdML, Ad(−9/−1), and Ad(−9/+9) promoters. The bottom (coding) strands of all three templates are identical. PstI and HindIII restriction sites are indicated in bold. The sequences of transcripts initiated with CpU and synthesized in abortive initiation and promoter escape assays are shown above the DNA templates.
