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Frequency of the computed 13Cβ chemical shifts for all 837 cysteines in cystine: A for cysteines in cystine. The data were binned using an interval of 0.5 ppm, and then fitted to a Gaussian function with a mean value x0 = 42.1 ppm, and standard deviation σ = 5.8 ppm; B same as A for reduced cysteines; with x0 = 27.3 ppm, and standard deviation σ = 2.4 ppm
