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Tn4001mod constructs containing the wild-type gapA and crmA gene from strain Rlow. Schematic representation map of Tn4001mod constructs containing wild-type crmA alone (SDCA) or both gapA and crmA (GCA1, i.e., the whole gapA operon). GmR is the gentamicin resistance gene. P is the outward promoter. B, BamHI; E, EcoRI; H, HindIII; X, XbaI.
