A monopolar fuel cell stack comprising proton exchange membrane fuel cells supplied with a gaseous anodic reactant, preferably hydrogen, and a gaseous cathodic reactant, preferably air. Further, this invention relates to both polyclonal and monoclonal antibodies to HSP22 and the production thereof. The allantoic fluid may then be sampled, or a substance injected into the allantois, by a vertical needle or probe traveling in a downward direction. At point A, differential signals IN, INX are added and output as a single-phase signal OUT. In the synthesis of 1,4-bistetrafluorobenzene by adding formamides as catalyst, there are remarkable advantages which include shortening the reaction time; simplifying the synthesizing steps and raising the yield of the product. As such, the assay can provide a valuable tool for studies of infectious disease pathogenesis and development of new vaccines and immunotherapies.