Andy Biotechnology Corporation (R& amp;amp;D Systems) is a leading U.S. biotechnology company founded in 1976 and is now publicly traded in the United States. R&D's representative products include ELISA kits, recombinant factors and antibodies, etc. These products have been favored by research clinical institutions around the world for their excellent and effective quality. R&D's products include ELISA kits, recombinant factors and antibodies, which have been recognized by clinical institutions around the world for their superior quality and efficacy;