FIGURE 4.
A and B, the active site of R2lox in the reduced (A) and oxidized (B) Fe/Fe-bound state, superimposed with the Mn/Fe-bound structure in the corresponding redox state. C, the nonactivated Mn/Mn-bound active site, superimposed with the reduced Mn/Fe-bound state. The same color scheme is used as in Fig. 2, with the Mn/Fe structures shown in transparent gray.