An assemblable body board is formed from a blank made from a sheet of a bendable or foldable material, such as fiberboard. The middle adhesive portion is less tacky than the first and second lateral adhesive portions. In some applications, the crosslinking component may be hydrophobic, so as to be generally not compatible with aqueous environments. The testing circuit includes a common gate line having a plurality of notches formed on an edge thereof, a plurality of channel layers, source electrodes, and drain electrodes.