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(A)-(B) Stall force trajectories showing multiple, outward- (A) and inward- (B) directed events in the harmonic potentials of the trap depicted to the left. (C)-(D) Histogram of stall forces for outward- (C) and inward- (D) directed stalling events, likely dominated by kinesin- and dynein-driven active transport, respectively. (C) and (D) indicate that the stall forces are similar in both directions.
