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Regulation prior to translation by splicing in BDV. S1–S3, transcription initiation sites; T1–T4 and t6, polyadenylation/termination sites; SA1–SA3, splice acceptor sites; SD1 and SD2, splice donor sites. I, II, and III are introns. N, nucleoprotein; P, phosphoprotein; M, matrix; G, glycoprotein; and L, polymerase. The open rectangle corresponds to the ORF of a putative protein. Other indications are as in legend of Fig. 1.
