Guidance cues and signal transduction mechanisms acting at the nerve growth cone are fairly well understood, but the intracellular mechanisms operating to change the direction of axon outgrowth remain unknown. We now show that growth cones integrate myosin II−dependent contraction for rapid, coordinated turning at borders of laminin stripes in response to signals from laminin-activated integrin receptors; in the absence of myosin II activity, outgrowth continues across the borders.
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