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Genomic organization of the Sireviruses. A phylogenetic analysis of the plant Pseudoviridae (Ty1/copia elements) was previously described (Gao et al., 2003). The neighbor-joining tree resulting from this analysis revealed two major groups, the classical Ty1/copia elements and the Sireviruses. The Sirevirus clade contains elements with unusually large Gag proteins and varied genomic organization with respect to env-like ORFs and breaks in translation between gag and pol.
