The CD and MCD of MIOX(II,III). The spectra of the mixed-valent MIOX mixture (black), MIOX(II,II) (red) and MIOX(III,III) (green) spectra are overlaid for (a) CD and (b) MCD. Subtraction of biferric and biferrous contaminants gives the (c) CD and (d) MCD of MIOX(II,III), which are Guassian resolved (grey). Protein concentrations were 1-3 mM.