Understanding the role of transport velocity in biomotor-powered   microtubule spool assembly
  We examined the sensitivity of microtubule spools to transport velocity. Perhaps surprisingly, we determined that the steady-state number and size of spools remained constant over a seven-fold range of velocities. Our data on the kinetics of spool assembly further suggest that the main mechanisms underlying spool growth vary during assembly. 
Amanda J. Tan, Dail E. Chapman, Linda S. Hirst, and Jing Xu
q-bio.BM physics.bio-ph