Antibodies are proteinaceous substances that neutralize antigens. Antibodies are chemically known as globulins or immunoglobulins. The human body can produce about 100 million (10 crore) antibodies. 85% of immunoglobulins are polypeptides and 15% are carbohydrates. Antibodies are produced from spleen, lymph glands, bone marrow, tonsils, thymus, appendix etc.