Abstract

The dynamics of polymerization (and annealing of fragments) and depolymerization (and fragmentation) of actin filaments (F-actin) is a key process in diverse cellular functions, including cell motility. Up to the present, there have been many spectroscopic studies in solution, which have clarified timedependent but averaged properties, as well as electron microscopic and other studies; but a single filament analysis, which is effective in clarifying not only time-dependent but also nonaveraged properties, has not yet been reported. Thus, direct observation of the polymerization-depolymerization dynamics of individual actin filaments is worthy of investigation.

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