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Sodium dodecyl sulfate-polyacrylamide gel electrophoresis of His-tagged recombinant proteins purified on Ni-NTA columns and stained with Coomassie blue. (A) Sll1556 protein (ca. 41.6 kDa) of Synechocystis strain PCC 6803; (B) type 2 IPP isomerase (37 kDa) of Streptomyces sp. strain CL190. The molecular mass range is as indicated on the left.
