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(a) Electrophoretic mobility of DNA as a function of the concentration of divalent ions at pH = 2.0. (b) AFM images of DNA forms induced by 3 mM Mg2+ at pH = 2.0. (c,d) DNA extension-time curves measured by MT in DNA, the releasing and stretching processes at 3 mM Mg2+, pH = 2.0.
