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Direct Reversible Protein Electrochemistry at a Pyrolytic-Graphite Electrode - Characterization of the Redox Thermodynamics of the Fe4S4 Siroheme Prosthetic Center in the Hexameric Dissimilatory Sulfite Reductase and the Monomeric Assimilatory Sulfite Reductase from Desulfovibrio-Vulgaris (Hildenborough) - Systematic pH Titration Experiments and Implications for Active-Site Chemistry Lui SM, Cowan JA Journal of the American Chemical Society, 116(25), 11538, 1994 |