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(a) Magnetic tweezers, similar to optical traps, trap a bead which is attached to either a motor protein or a microtubule. An external force (Fm) can then be applied to the bead via a magnetic field. The effect of the force on the bead can be seen between (b) when no magnetic field is present and (c) when the field is applied. (b) and (c) adapted from Ref. [28].
