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was first developed by Warburg, whose view seems to be that the essential biological role of the thiol group in such compounds as glutathione is the provision of a suitable vehicle for the exhibition of the catalytic activity of iron. The matter is of some importance since the quantitative establishment of the above contention would undoubtedly lead to a reconciliation of many conflicting views of the mechanism of biological oxidation-reduction.
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Cannan et al. (1929) studied this question.
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