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Fig. 5. Effect of divalent cations on recombinant CuquEndo activity. Reaction
mixtures containing 1 µl of recombinant CuquEndo and 500 ng of plasmid DNA
in a final volume of 20 µl were incubated for 10 min at 37°C in buffers
with cation concentration ranging from 0 to 10 mmol l-1. The
digested DNA plasmids were resolved in 1.2% agarose gels and visualized under
UV light. (A) MgCl2. (B) CaCl2.