Fig. 7. (A) Analytical solutions of the 1D model initial pseudo steady state equations. In the fragment, the MT minus- and plus-end densities are linear functions of the spatial coordinate. Upon dynein stimulation, the granules aggregate loosely to the center of the fragment within tens of seconds. (B) Numerical solutions of the 1D model steady state equations. In several minutes, granules aggregate tightly in the center with most MT minus ends focused in the pigment aggregate. Note that the plus ends at the fragment boundary are not shown. The total numbers of the plus and minus ends are equal.