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This paper presents bioMEMS force sensors, consisting of a probe and flexible beams, to study mechanobiological response of single living cells subjected to mechanical injury. Mechanical injuries are simulated by the application of large indentation on the cells by the sensor probe. The green fluorescent protein (GFP) technique is used to visualize the evolution of the actin network in the cells. The lateral indentation force response measurement capability of the sensors is shown. Two new types of remodeling, large buckling of stress fibers and actin agglomeration, in the actin network in a cell due to mechanical stimuli are reported.