Fig. 5. Top view of stretching of an RBC by the two optical traps; (A) the traps were positioned on the two ends of the RBC with the trap separation of 5 μm, (B) the RBC was reached to its maximum length just before escaping from the moving trap, (C) the relaxed RBC after escaping from the moving trap. A video of the experiment was provided as ESI (Video S1†).