...SV40 PolyA (Simian virus 40 PolyA, also called PolyA) sequence is DNA sequence (240 bp) that possesses the activity of transcription termination and can add PolyA tail to mRNA....
Contamination, my arse.
Plasmids 101: Terminators and PolyA signals
We may have an explanation for CoupFlu vaxx-rekated turbo cancers...