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Schematic diagram of the recombinant plasmids. Kan, kanamycin resistance gene; Ori, the replication origin of plasmids; Ald4, the aldehyde dehydrogenase from S. cerevisiae; PK, the native promoter of dhaB gene in K. pneumoniae; Pkana, the promoter of kanamycin resistance gene from plasmid pET-28a; rpoE, rpoS; dksA, sigma factor genes from K. pneumoniae
