An antibody is a protein produced by the immune system to identify and neutralize foreign objects like bacteria and viruses. Antibodies recognize specific antigens unique to their target. Biological therapies for treating diseases employ substances like monoclonal antibodies, interferons, and interleukins. Monoclonal antibodies in particular are increasingly prominent in medicine. They are named using a standardized nomenclature indicating the target, source species, and whether it is a monoclonal, chimeric, or humanized antibody. Common examples of monoclonal antibodies used for treatment include rituximab, infliximab, and adalimumab.