Before revision:  Depending on the ratio of stresslet strength to elasticity, the linear instability can develop into unsteady states with large-amplitude non-linear deformations, where the filament conformation and the center of mass velocity fluctuate frequently. In planar flows, these unsteady states finally decay into steady states where the filament has constant translational or rotational motion .
After revision:  Depending on the ratio of stresslet strength to elasticity, the linear instability develops into non-linear fluctuating states with large amplitude deformations. The dynamics of these states can be qualitatively understood as a superposition of translational and rotational motion associated with filament conformational modes of opposite symmetry .