A back side illuminated image sensor may be provided with an array of image sensor pixels. The control circuit receives a select signal and controls the data transfer in the peripheral circuits in accordance with a logic state of the select signal. The surface area of one of the flowable superabsorbent precursor impregnated with the stabilized structure and the superabsorbent material formed within the structure is increased. The present invention eliminates the influence of the membrane-denaturing agent on the substance to be injected into the cell.