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THIS paper describes the results of a spectroscopic examination of 195 specimens of different human tissues, both healthy and diseased. The object of the investigation was to determine whether any chemical elements were constantly present in the tissues in addition to those already recognised as being universal constituents of protoplasm (C, H, 0, N, P, S, Na, K, Mg, Ca, Cl, Fe, Cu) and to discover what variations might occur both between different organs and between healthy and diseased tissues.
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Sheldon et al. (1931) studied this question.
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