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Electron spin relaxation measurements on low-spin Fe³⁺ in several proteins show that they occupy a space of fractal dimensionality d=1.65±0.04, in conformity with the dimensionality d=5/3 of a self-avoiding random walk. Analysis of myoglobin x-ray data independently confirms this fractal dimension.
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Stapleton et al. (1980) studied this question.
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