Zp versus slide. Zp versus slide for the nucleosomal DNA dataset. The two solid horizontal lines at Zp = 1.3 Å and Zp = 0.8 Å denote the cutoff values for classifying a dinucleotide step as A or B-DNA like, with Zp > 1.3 Å indicating an A-like structure, Zp ≤ 0.8 Å indicating a B-like structure, and 0.8 Å < Zp ≤ 1.3 Å indicating an intermediate structure. The solid vertical line at slide = 0.2 Å denotes the mean value for slide in free B-DNA, while the two dashed vertical lines at slide = -2.2 Å and 2.6 Å denote the values 3σ away from the free B-DNA mean value for slide. All the indicated values are based on the analysis of high resolution X-ray crystal structures of DNA .
Marathe and Bansal BMC Structural Biology 2011 11:1 doi:10.1186/1472-6807-11-1