Bacterial colons, which contained recombinant plasmids were cultured in LB broth enriched with 20 mM glucose until OD600 reached 0.5. Thereafter, IPTG (Isopropyl-β-D-thiogalactopyranoside) was added to the cultures followed by cultivation for another 4 h. Expression of the recombinant protein (~67 kDa) was examined by SDS-PAGE.
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