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Measured length dependence of the electrophoretic motion of microtubules for perpendicular orientation (open circles) and for axial orientations (filled squares) to the electric field (E =−8 kV/m). The solid lines are guides to the eye. The dotted lines show the expected length dependence of the purely hydrodynamic motion [≈ln(L/R)] for cylinders (R = 12.5 nm).
