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We study, by laser flash photolysis, the mechanism of quenching the triplet state of zinc cytochrome c, 3 Zncyt, by the iron(III), iron(II), iron-free, and heme-free forms of cytochrome c. The method of inserting zinc(II) ion into the heme group in a protein overcomes the difficulties in studying redox reactions between two heme proteins having similar absorption spectra. Quenching of positively...
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