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The average MT length 〈xMT〉 as a function of the number of MTs m in a system with closed feedback for tubulin-sequestering stathmin (a and b) and catastrophe-promoting stathmin (c and d) at different stathmin/tubulin s = stot/[T0] values: (a) s = 0.425, (b) s = 0.44, (c) s = 0.5, and (d) s = 2.0. (Horizontal solid and dashed lines) Mean MT length for systems without Rac (ron = 0) and constitutively active Rac (ron = 1), respectively.
