Antibodies are released by ____ cells in response to a specific____. They are a protein made of ____ polypeptide chains. The two longest chains are called ____ chains. The two short chains are called ____ chains. The antigen ____ sites are at the ____ of both arms of the ____ shape and this is also known as the ____ region because it is different on different antibodies. The rest of the Y shape is called the ____ region because it is exactly the same for every antibody.

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