Gamma globulins, or antibodies, are substances found in the blood that are created from blood plasma. They are made by the body in response to bacteria, viruses, fungi, animal dander and cancer cells. As a result, the body can utilize its gamma globulins to fight off disease.
There are five major types of gamma globulins found in the human body: IgA, IgG, IgM, IgE and IgD. IgA antibodies are found on the body's surface. They are also found in saliva, tears and blood. IgG antibodies are found in all body fluids and are the most common antibodies. IgM are the largest antibodies in the body and are found in the blood and lymph fluid. IgE antibodies are found in the lungs and mucous membranes and cause the body to react against allergens. IgD antibodeis are found in the abdominal and thoracic cavities and their function is still unknown.