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(a) Experimental setup for force–extension measurements of λ-phage DNA–IHF complexes. A force is exerted on the DNA-tethered paramagnetic bead by a pair of magnets, whose height can be controlled to change the force's magnitude. (b) Experimental setup for measurements of the amplitude of transversal Brownian motion ABM of small beads tethered by short DNA molecules to a glass slide in the presence of IHF.
