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Multiple sequence alignment of the α and β subunits of NDO-P, NDO-R, and BPDO-R. Secondary structure information for NDO-R is shown above the aligned sequences. The shaded residues are completely conserved, and similar residues based on MultAlin (9) are boxed. The conserved residues that coordinate the mononuclear iron (solid circles) and the Rieske iron-sulfur cluster (triangles) are indicated below the alignment. The bridging aspartic acid is indicated by a star.
