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Distributions of stepping times after a UV pulse and post-step survival times, for vesicles that stepped after early or late pulses. (A) Fraction of steppers not yet undergone a step a time t1 after the nearest UV pulse. Vesicles that stepped after early (pulses 2–4) and late (pulses 6–8) pulses are indicated as squares or circles, respectively. (B) Fraction of steppers not yet fused a time t2 after having made a step, grouped for early and late pulses as in panel A.
