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The length distribution of the DNA substrate measured with FemtoScan Online software using parameter “curve”. The data were plotted as statistical histogram and fitted with Gaussian distribution (Origin software). The most probable value of 116 nm was taken as the total length of DNA molecule. The DNA substrate consists of 353 bp; thus the linear density of the DNA filaments on the AFM images is 0.33 nm/bp that is very close to cristallographic value 0.34 nm/bp.
