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Comparison of 3-fold pores in (A) as-isolated-2 and (B) Fe-soaked C89S/K96C BfrB suggests a possible path for the ingress of sulfate to the interior cavity. Sulfate is shown as blue (sulfur) and red (oxygen) spheres, and Fe3f ions as orange spheres. Key side chains are shown in sticks with nitrogen in blue and oxygen in red.
