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Measurements of the force between hematite and OmcA. The top graph shows 14 approach (light red) and 14 retraction (dark red) force curves. The dotted black line corresponds to the theoretical force-extension relationship for a polypeptide composed of 748 amino acids (single OmcA molecule), as predicted by the WLC model (equation 2). The bottom schematic illustrates one approach/retraction cycle, starting at frame 1 and ending at frame 5.
