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Zero-field Mössbauer spectrum of the (deprotonated) [2Fe-2S]0 Rieske cluster at pH 10, 4.2 K. The data were modeled by using Lorentzian doublets and the nested configuration, and subspectra a and b represent the cysteine- and histidine-coordinated sites, respectively. Subspectrum c is the product of cluster degradation.
