There are many different infectious organisms that can harm the human body, so antigens are produced by the body's immune system to help fight infectious organisms. There are also antibodies produced by the body that target specific viruses and bacteria to eliminate them. Each different antibody is cloned when the virus or bacterium is identified to fight it. There are also different forms of defense that include skin, mucous membranes, physical and waterproof barriers, and cell shedding so that microbes do not form colonies. Mucus is important for trapping and preventing harmful organisms from entering the body. Mucus is also constantly produced to help keep the body safe. White blood cells help phagocytose the harmful organism and when they enter the body phagocytosis occurs. Macrophages also remember whether the cell is elvish or not itself protein-based. There is also an inflammatory response when an injury or infection occurs, so there is blood flow which causes redness and heat. When the infection is more widespread within the body, white blood cells release pyrogens which cause an increase in body temperature. There are specific types of antibodies produced to fight the infection; these cells are called A lymphocytes and B lymphocytes. These antibodies will circulate within the bloodstream to find the infection and help eliminate it. There are some too