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Structures of tet(X5)-carrying plasmids and comparison of the genetic environments of tet(X5)-carrying regions. The arrows indicate the direction of transcription of the genes. Genes are differentiated by colors. Regions of >99% homology are marked by dark gray shading. Regions of >80% homology are marked by light gray shading. Black arrowheads indicate the positions of primers used for amplification of the ISVsa3-xerD-tet(X5)-abh-csd minicircles.
