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Histograms of DNA lengths ejected in the presence of magnesium chloride. (A) The control experiment was done in 10-fold diluted His1 buffer containing 3.5 mM MgCl2. (B) Modified 10-fold diluted His1 buffer containing 50 mM MgCl2. (C) Modified 10-fold diluted His1 buffer containing 100 mM MgCl2. (D) Modified 10-fold diluted His1 buffer containing 250 mM MgCl2.
