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Organization of the ser2 gene cluster and flanking IS1601 sequences. The ser2 gene cluster is represented by the solid box, and IS1601 elements are represented by slashed boxes. Dashed lines depict the 9.6- and 7.9-kb fragments of pJTB232 and pJTB230 that were used as templates for the sequencing of IS1601-L (left copy) and IS1601-R (right copy), respectively. H, HindIII; C, ClaI.
