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Antibody:-  Structure, Types and Function Antibody (Ab) also know as Immunoglobulin (Ig) is the large Y shaped protein produced by the body's immune system when it detects harmful substances, called antigens like bacteria and viruses. The production of antibodies is a major function of the immune system and is carried out by a type of white blood cell called a B cell (B lymphocyte), differentiated B cells called plasma cells. The produced antibodies bind to specific antigensexpress in external factor and cancer cells. Structure of Antibody:-   Antibodies are heavy (~ 150 kDa) globular plasma proteins. The basic structure of all antibody are same.           There are four polypeptide chains:- ▪Two identical heavy chains  ▪Two identical light chains ▪ Connected by Disulfide bonds.         Light Chain (L) consists polypeptides of about 22,000 Da and Heavy  Chain (H) consists...