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Complexity of TSSs. (A) The TSS pattern of UL10 transcript exhibits an especially high complexity. Several TSSs are located downstream from the translation initiation site, resulting in truncated ORFs. RNAs harboring these truncated ORFs may code for N-terminally truncated transcripts or may be non-coding RNA. (B) Divergent overlaps between the ul20 and ul21 genes. These overlaps are caused by the high variability in the TSS of UL21.
