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Thioredoxins have been purified from pig heart and potato tuber mitochondria which differ in Chromatographie behaviour, enzyme activating capacity, and slightly higher molecular mass (M r = 12500) from the major thioredoxin(s) present in mitochondria-free fractions of the same tissue. Both mt-thioredoxins can serve as hydrogen donor for E.coli ribonucleotide reductase but only the plant protein...