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Fig. 2. Flow-stimulated luminescence in Lingulodinium polyedrum. (A) Stimulation by stirring, which started at approximately 13.4 s. (B) Computed maximum shear stress for Couette flow during and after 1 s acceleration of the outer cylinder to final velocities of 0.8-6.4 revs s-1 (final shear stress=0.11-0.86 N m-2). (C) Typical responses of night-phase cells to the developing Couette flows shown in (B).