Redistribution of strain focusing during onset of shear stress. Magnitude (color scale) and orientation (bars) of principal stretch ratio λI during consecutive 3-min intervals (A, C, and E) before and (B, D, and F) after onset of shear stress (12 dyn/cm2, left to right). Values are shown for optical sections located (A and B) 0.3 μm, (C and D) 2.4 μm, and (E and F) 4.6 μm above the coverslip.