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Spontaneous rotation and flapping oscillations of an actin filament driven by myosins have been observed in the in vitro setup of a quasi-two-dimensional motility experiment, where the head of the filament is spatially fixed. We present a simple phenomenological dynamical model that exhibits both the rotation and the oscillation of the filament as symmetry breaking instabilities of the filament conformation under pertinent boundary conditions.
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Sekimoto et al. (1995) studied this question.
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