The invention relates to the supply of power to a driver circuit for a switching transistor in an operating circuit, in particular for lamps. Each of the probe pins may be independently movable relative to the probe head portion. A storage density of 1-2F2 per bit can thus be achieved. In addition, the invention includes a vaccine comprising a eukaryotic histone H1 protein and a method of vaccinating an animal using the vaccine. The two Lots are then merged and processed according to the original predefined process steps continue on both Lots.