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. 2013 May 20;8(1):245. doi: 10.1186/1556-276X-8-245

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Copyright ©2013 Zhang et al.; licensee Springer.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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The duration time histograms in a logarithmic scale. (a) In 1 M KCl solution for the 20-nm diameter nanopore, (b) in the mixed solution with 0.5 M KCl + 0.5 M MgCl₂ for the 20-nm diameter nanopore, (c) in 1 M MgCl₂ solution for the 20-nm diameter nanopore, and (d) in 1 M MgCl₂ solution for a 7-nm diameter nanopore.