Rate constants have been obtained for the biphasic electron-transfer reduction of Tyr˙ and FeIII2 of the B2 subunit of ribonucleotide reductase (RNR) with long-lived radical reductants, e.g. methyl viologen, MV+˙, generated in situ by reaction with dithionite.
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Lam et al. (1990) studied this question.
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