Figure 1.

Capture of a moving filament. The images shown here were selected from a time-lapse movie acquired at 4 s intervals. The white arrowheads mark the leading and trailing ends of the moving filament. The filament moved rapidly into the gap, pausing intermittently, and then stopped shortly after the start of the flow of the permeabilization solution. Proximal is right, and distal is left. Scale bar, 6 μm. See also QuickTime movie 1 (available at www.jneurosci.org as supplemental material).