Detection of a functional polyadenylation signal upstream of the ESS
region. (A) Sequences of the BDV ESS region. Schematic
map of BDV ORFs is shown at the top. Splice and polyadenylation sites
of BDV are shown by bars. Primers for 3′RACE analysis and putative
elements of BDV ESS are also indicated. A polyadenylation signal (t6)
and possible motifs for ESS are boxed. (B) 3′RACE
analysis of BDV. RNAs from BDV-infected cells were subjected to 3′RACE
analysis by using the primers shown in A. lanes: M,
marker; 1, MDCK/BDV cells; 2, MDCK cells; 3, C6BV cells; 4, C6 cells;
5, OL/BDV cells; 6, OL cells.