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The Ald4 activities of the recombinant strains. (1) Recombinant strain K. pneumoniae(pET-pk). pET-pk: an empty vector carrying pk promoter, (2) recombinant strain K. pneumoniae(pET-pk-ald4). (3) Recombinant strain K. pneumoniae(pET-pk-ald4-Pkana-rpoE), where ald4 was coexpressed with rpoE
