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. 2016 Mar 28;212(7):777–787. doi: 10.1083/jcb.201510064

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© 2016 Tanimoto et al.

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Figure 5. — Aster shape–motion relationships. (A) Proposed model for how centering MT asters may determine their speed and directionality. Each MT exerts a pulling force on the centrosome that scales to MT length. Aster shape asymmetry, which corresponds to the difference between centrosome position and aster geometrical center, is characterized by a unit vector $\vec{e}$ corresponding to aster directionality. Asters migrate with a constant speed determined by the growth rate V_p. Therefore, the aster velocity vector can be simply represented as $V_{p} \cdot \vec{e}$ . (B) These shape–motion relationships enable asters to probe local cell geometry to faithfully find the center in any cell shape.