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Velocity of pilus retraction is bimodal. (a) Histogram of retraction velocities at varying force (MS11) of in total 149 events from 29 bacteria (b) Histogram of retraction speeds at varying PilT concentrations at 30 pN. (c) Average velocity of the low velocity mode: (gray) MS11 and (black) MS11pilT oe. (d) Average velocity of the high velocity mode: (gray) MS11 and (black) MS11pilT oe.
