Figure 1: Schematic diagram of the monocistronic and bicistronic DNA vaccines.
The transcriptional control units and gene sequences are shown: CMV IE, cytomegalovirus immediate early promoter/ enhancer sequence; IVS, intervening sequence (synthetic intron); IRES, internal ribosome entry site; polyA, SV40, polyadenylation signal; PCV2-ORF2, porcine circovirus type 2 ORF2 gene; PPV-VP2, porcine parvovirus VP2 gene.