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Dependence of the free-solution mobility of dsDNA on the sodium acetate concentration ([NaAc]). The symbols represent the following: solid circle (●), ds442; open circle (○), ds26a; and open triangle (▵), ds26b. The solid line corresponds to a three-parameter exponential decay of the combined mobilities of the three dsDNA strands as a function of ionic strength. The dashed line corresponds to the mobility predicted by the Manning electrophoresis equation (34), assuming b = 1.7 Å.
