1. Ken Jacobson is in the Department of Cell Biology and Anatomy and Lineberger Comprehensive Cancer Center, University of North Carolina-Chapel Hill, Chapel Hill, North Carolina 27599-7090, USA.

Correspondence to: Ken Jacobson¹ e-mail: frap@med.unc.edu

Abstract

One of the puzzles about actin-based cellular motility is how directionality is spontaneously imparted in an initially symmetrical situation. A computer model representing actin filaments symmetrically surrounding a bead reproduces the experimentally observed symmetry-breaking and the directed motion of the bead.

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