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Typical DNA overstretching transition behavior. (A) Force-extension curve representation of the overstretching transition of a λ-DNA in 150 mM NaCl, 10 mM Tris, pH 7.5 at 24°C. Open squares show the increasing-force scan and solid stars show the decreasing-force relaxation scan. (B) The extension change kinetics of the DNA in (A). Each force is denoted by a unique color. Blank gaps correspond to the periods when forces were being changed.
