A material extraction system is provided for an underground mine. The invention also provides expression vectors, host cells, antibodies, agonists, and antagonists. The first pin set is extended into the first hole and electrically connected to the first circuit board. The turbine blade in accordance with the preferred embodiment of the present invention is cast from a high density nickel base alloy with high temperature capability and improved creep capability. If the call to a given cellular telephone is not answered by a human voice, the cellular telephone is suspect.