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Dynamic radial contractility of periodic actin rings along axons. Time-lapse 2D SIM images at 20-s intervals showing the diameter changes of periodic axonal actin rings periodic actin rings labeled with SiR-actin. Four bracket segments were amplified in the right panels. Diameter changes are indicated with arrows. Scale bars = 1 µm (left); 5 µm (right). Video is 1 frame/s.
