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![]() ![]() These foreign molecules are called antigens, and their molecular recognition by the immune system results in selective production of antibodies that are able to bind the specific antigen. If not treated with antibodies after a rabies infection, death can result.Antibodies are host proteins that are produced by the immune system in response to foreign molecules that enter the body.The antibodies will control and fight the infection, giving time for the body to produce its own antibodies.The antibodies are injected directly into the person after a possible rabies infection.Monoclonal antibodies are produced using the method described in 11.1.5.If the woman is not pregnant, no HCG will be present in her blood, and therefore there will be no color change.When the mixture is introduced into a blood sample of a woman that is pregnant, theantibodies will bind to the HCG in the blood, causing a change in color.HCG Antibodies are combined with color-changing enzymes.Monoclonal antibodies can be produced by injecting a lab animal with HCG, as it recognizes this as antigen.Human chorionic gonadotrophin (HCG) is produced by an embryo in early pregnancy.People with blood type O just have the basic antigen sequence that all blood cells have and are therefore not attacked by A or B antibodies therefore, blood type O is known as the universal donor (O negative has no Rhesus factor). ![]() If they get a transfusion with blood type B, their immune system will attack and destroy the foreign blood cells with the B-antigen on the surface For example, someone with blood type A (antigen A on the surface) contains anti-B antibodies in their plasma. ![]()
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