Fig. 9: Switch of polymerization can lead to reorientation.
From: Optogenetic control of migration of contractile cells predicted by an active gel model
Bifurcation diagrams for different polymerization velocities at the right edge \({v}_{p}^{+}\) with \({v}_{p}^{-}=0\) (a) and at the left edge \({v}_{p}^{-}\) for \({v}_{p}^{+}=0\) (b). The red circle marks the motile steady state velocity for \({v}_{p}^{+}=0.05\). c Repolarization attempt with a small polymerization velocity \({v}_{p}^{-}=-0.035\) does not induce motility reorientation. The myosin-enriched layer is spread but no repolarization occurs, as visible in the kymograph of concentration c in internal coordinates, in the velocity V and the length L. The dotted red line marks the time at which instantaneous switching of polymerization occurs. d Repolarization is successful for a larger \({v}_{p}^{-}=-0.045\): the polymerization is able to overcome the polarization from myosin motors.
