Before revision:  In vivo myosin-V activity generates a forceof F \sim 0.4 pN, with a power-stroke of length \Delta x \sim 20 nm and duration \tau \sim 300 \mus , that drives vesicle motion at v_v \sim 320 nm/s.
After revision:  In vivo myosin-V activity generates a forceof F \sim 0.4 pN, with a power-stroke , and velocity). We find that myosin-V induces rapid kicks of duration \tau \sim 300 \mus , that drives vesicle motion at v_v \sim 320 nm/s.