How do microtubules guide migrating cells?

@article{Small2002HowDM,
  title={How do microtubules guide migrating cells?},
  author={J. Victor Small and Benjamin Geiger and Irina Kaverina and Alexander D Bershadsky},
  journal={Nature Reviews Molecular Cell Biology},
  year={2002},
  volume={3},
  pages={957-964}
}
Microtubules have long been implicated in the polarization of migrating cells, but how they carry out this role is unclear. Here, we propose that microtubules determine cell polarity by modulating the pattern of adhesions that a cell develops with the underlying matrix, through focal inhibitions of contractility.