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Zoomed in view of a 4-fold pore in wt and mutant BfrB molecules. The top row depicts views from the interior cavities, while the bottom row shows cross-sectional views with a subunit removed. Fe4f-1 iron ions are shown as orange spheres, Fe4f-2 iron ions as blue spheres, Fe4f-3 iron ions as cyan spheres, water molecules as yellow spheres, and potassium ions as purple spheres, nitrogen in blue and oxygen in red.
