Figure A2.

Representative images of the flowing RBC at frame numbers 0 (top), 20, 40 60, and 80 (bottom), respectively, where the speed of the cell is 1200 $\mathsf{\mu }$m/s (see also Video S1). A representative numerical result of a stable slipper-shaped RBC subjected to $Ca$ = 0.01 (calculated centroid velocity $V_c\sim$ 25 $\mathsf{\mu }$m/s) is also displayed (see also Video S2).