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THE necessity of a coenzyme for the oxidation of lactic acid by the lactic de- hydrogenase of animal tissues has been shown by Szent-Gy6rgyi [1925]. The preparation of a concentrate of this substance from mammalian heart tissue has been described by Szent-Gyorgyi and Vargha [1932]. Recently Banga and Szent-Gyorgyi [1933] have further purified the concentrate by precipitation with phosphotungstic acid and picric acid and have obtained the coenzyme as a semi-crystalline picrate. By investigation of the products of hydrolysis of the coenzyme they concluded that it was a monophosphate of a monoadenylnucleo- tide not identical with muscle adenylic acid or adenylpyrophosphate, but possibly identical with cozymase.
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Birch et al. (1934) studied this question.
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