Abstract
We show that the exponential length distribution that is typical ofactin filaments under physiological conditions dramatically narrowsin the presence of i) crosslinker proteins or ii) polyvalentcounterions or iii) depletion-mediated attractions. A simpletheoretical model shows that, at equilibrium, short-rangeattractions that are known to enhance the tendency of filaments toalign parallel to each other, lead to an increase in the averagefilament length and a decrease in the relative width of thedistribution of filament lengths.
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