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Comparison of CD spectra of as-purified [2Fe-2S] Grx4 (blue solid line) and [2Fe-2S] Php4-Grx4 (black solid line) with reconstituted [2Fe-2S] Grx4 (blue dotted line), [2Fe-2S] Php4-Grx4 (black dotted line), and [2Fe-2S] Php4(C221/227A)-Grx4 (red line).
