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We have previously shown that a full stretching of native carbonic anhydrase B (CAB) using the atomic force microscope could not be achieved, presumably due to the presence of a 'knot' in the C-terminal region of the protein. When we used an engineered dimer of CAB, where the N-terminal monomeric unit (unit I) was expected to be 'knotless', we successfully recorded extension of the protein up to 110nm...
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