In accordance with an embodiment, a probe card comprises a contact pad interface comprising front side contacts and back side contacts electrically coupled together. Also provided are a composition that includes a GBS toxin receptor polypeptide and a method for making such a composition. In accordance with one aspect of the invention, the check valve assembly comprises a cartridge comprising a member separate from the plunger and defining a valve seat. These therapeutic drugs, agents or compounds may also further reduce a biological organism’s reaction to the introduction of the medical device to the organism. A deflector side of the deflecting member is positioned for deflecting ascending vapor away from the discharge region. This overlapping pixel configuration precludes absorption of light in inter-pixel regions that could give rise to the appearance of dark lines between bright reflective pixel electrodes.