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Schematic drawing highlighting the structure of the mRNAs expressed from the L4 unit. The adenoviral major late transcription unit (MLTU) contains five coding regions called L1-5, indicated by open arrows. The dsDNA adenoviral genome is represented as a double black line. The L4 transcripts (pVIII, L4-33K, L4-22K, L4-100K), with the corresponding genomic regions in Ad5 and their splicing pattern, are indicated.
