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Schematic diagram of Tn1549 flanked by imperfect IRs. Coding regions for vanRB (R), vanSB (S), vanYB (Y), vanW (W), vanHB (H), vanB (B), vanXB (X), and the excisase (I) and integrase (N) genes are shown with arrows. The regions amplified and the positions of the primers used are indicated.
