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cleavage and polyadenylation. It has been reported that sequences upstream (U3 region) and downstream (U5 region) are needed in order to make the cleavage process efficient.
*PBS, or primer binding site, is 18 nucleotides long and has a specific sequence that binds to the tRNA^Lys primer required for initiation of reverse transcription.
*Psi (?), or the Psi packaging element,

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