(a and b) Total filament length (denoted l, solid), and total amount of hydrolyzed subunits (denoted n, shaded) as function of time for the case of vectorial hydrolysis (left panel) and random hydrolysis (right panel) (the total concentration of subunits cT = 0.7 μM; one filament in a volume of 10 (μm)3). Note that the point where the two curves meet in the random hydrolysis model occurs much earlier compared to the case of vectorial hydrolysis (≈10,000 s). (c and d) The variance (σ2 = 〈l2〉 – 〈l〉2) as a function of time is plotted for the vectorial model and random model, respectively.