The invention concerns nucleic sequences coding for a protein capable of interacting with the AT2 receptor, oligonucleotides included in said sequences, their applications as probes and for expressing said proteins, vectors useful for said expression, host cells containing said vectors, and study model of AT2 receptor. The drive gear includes a body for engaging the generally cylindrical imaging component; a cylindrical shaft attached to the body, the cylindrical shaft having an end surface; and three prongs extending longitudinally outward from the end surface. The heat exchanger discharges the working fluid at a lower temperature than a temperature of the relatively hot working fluid of the first tank. The layered image is the combined view of the primary image, the transparent layer and icons on the transparent layer.