The present invention provides a general approach for G protein coupled receptors that may be used to define agonists and antagonists, and the specificity of receptor coupling to G protein subunits. An apparatus and a method for manufacturing the three-dimensional netted structure. The method includes creating application profiles, based, at least in part, on the received information. The method for making the rail comprises the steps of extruding an aluminum blank, cutting the blank to a specified length to form the rail, stamping the apertures in the vertical wall portion of the rail, drilling or stamping the apertures in the flange portion of the rail and applying a finish to the rail.