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Physical map of the R. etli rpoN region. The 1.8-, 4.6-, and 6.1-kb EcoRI fragments hybridizing to the A. tumefaciens probe are shown above the physical map of the 5.6-kb region that was sequenced. Triangles represent insertions of the Ω-Km interposon or the uidA-aphII cassette. The positions and orientations of the identified ORFs are indicated below the restriction map. Restriction sites are abbreviated as follows: B, BstXI; H, HindIII; E, EcoRI; N, NotI; P, PstI.
