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A further study of the structural organization in a-keratin has been made by examining the effect on the X-ray diffraction pattern of human hair after reaction with heavy atoms. It has been found that many of these features can be explained in terms of the nature and perfection of the microfibril packing. It is concluded that in many instances the heavy atoms are deposited in discrete and regularly arranged sites in the crystalline regions of the structure.
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Fraser et al. (1960) studied this question.
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