The worm - like structures are microtubules driven by kinesin motor proteins. (sciencedaily.com)
Protein friction limits diffusive and directed movements of kinesin motors on microtubules. (dresden-ipp.de)
This sliding was mediated by the minus end — directed kinesin motor Klp2, which helped microtubules to become properly organized with plus ends predominantly oriented toward the cell ends and minus ends toward the cell center. (science.sciencemag.org)