A polycide structure for use in an integrated circuit comprises a silicon layer; a barrier layer comprising ZSix where x is greater than two and Z is chosen from the group consisting of tungsten, tantalum and molybdenum; and a metal silicide layer, preferably cobalt silicide. The preferred embodiments include a telecommunications system that, after receiving a dialed number from a calling party, selects a particular destination number and routes the call to that number. The transgenic knockout mouse with a homozygous FcRn disruption is also unable to absorb maternal IgG in the prenatal or neonatal stage of development. The semiconductor layer is disposed between the insulating layer and the passivation layer, wherein the insulating layer and the passivation layer have a trench and a lateral etched groove located on the sidewall of the trench, and the lateral etched groove exposes the side edge of the semiconductor layer. Therefore, the flexible printed circuit substrate may be connected to the substrate by a single assembling process.