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Fluctuations of the force, acting from the DNA on the bead attached to the molecule end. The amplitude of the fluctuations is plotted as a function of DNA length for different values of applied force. There was no preliminary averaging of the force values in this calculation. It was found that the results of BD simulations of the force fluctuations do not depend on the length of the model chain if it corresponds to DNA molecules >1 kb in length.
