The present invention relates to a class of indolylquinone compounds that inhibit GRB-2 adaptor protein function, pharmaceutical compositions comprising these compounds, and methods for ameliorating the symptoms of cell proliferative disorders associated with GRB-2 adaptor protein function using these compounds. A coil driver has transistors connected in a positive feedback configuration and is coupled to a supply voltage in a controlled manner by measuring the output power and opening or closing a switch as needed between the power supply and the coil driver. The conduit defines a conduit passageway having a conduit inlet and a conduit outlet. The demand metric are used to order the item listings, when the item listings are being presented in a search results page.