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Model for the mutual orientation of the histidine imidazole remote 14N dipolar superhyperfine principal axis systems in (A) soluble Cu2+-Aβ(1-16) and (B) fibrillar Cu2+-Aβ(1-40). Figure axes represent the direction cosines, relative to the reference x, y, z-axis system (brown). The dotted surfaces show the 99% confidence interval, that corresponds to the Euler angles, [αA, βA, γA].
