A keypad arrangement for an electronic device comprises a keypad comprising activatable keys. The serum or plasma separating composition contains a liquid resin component having a partition wall-forming capability, a hydrophilic inorganic powder, a hydrophobic inorganic powder, and an organic compound serving as a thixotropy enhancer, wherein the organic compound is a polyalkylene glycol andor a derivative thereof and is made of at least one type of polymer. Purified enzymes and the isolated DNA fragments encoding them are also provided. A summing resistor is connected across the two sense inputs, and coupling circuitry is operable to couple voltages appearing across the current sensing resistors to the summing resistor. If the scene has changed, then the touch to focus mode ends and a default automatic focus mode initiates.