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Minimum force required to observe a decrease in length versus time. (A) 1 mM ATP at pH 7.6 and several RecA concentrations; the inset shows the change in length after changing force to 5 pN in 4 µM RecA, 1 mM ATP and pH 7.6. (B) 1 µM RecA at pH 7.6, and several ATP concentrations.
