... length and contain multiple heavily-spliced transcripts flanked by two inverted terminal repeats (ITRs...and late (L1, L2, L3, L4, L5) regions. Early transcripts are expressed shortly after the virus enters ...replication and host cell manipulation. Late transcripts are expressed after DNA replication starts and...produced by replacing the early and late adenoviral transcript regions between the two ITRs with the transgenes...removing the E1 region, containing the E1A and E1B transcripts, and the E3 region from the viral genome. This...plasmid E2A, E2B, E3, E4 in trans Adenoviral early transcript regions involved in viral DNA replication and.... L1, L2, L3, L4, L5 in trans Adenoviral late transcript regions that encode for structural capsid proteins...