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Genetic organization of PcEV, SERV, and BaEV. Rectangles indicate ORFs for the genes marked. C-type genes are indicated by dots. D-type genes are indicated by stripes. PcEV contains two type C ORFs for the gag-pol and env genes, which overlap. SERV contains four type D ORFs, for the gag, pro, pol, and env genes. BaEV is a type C/D chimeric virus which contains a type C ORF for gag-pol and a type D env gene.
