With the removal of all viral genomic RNA and tRNA, the PBS sequence at the 3' end of the plus-strand strong-stop DNA (+sssDNA) is free to pair with the complementary PBS sequence at the 3' end of the minus-strand DNA, to generate a circular structure (Telesnitsky and Goff 1997).
De Clercq, E, Anne, J, Jonckheere, H
Varmus, HE, Hughes, SH, Coffin, JM
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