Oh... :D Well... in the case of blood. Sorry, this is all I have cause I am studying into medical.
Antigen's (A blood has A-Antigens) Antigens stimulate the body to make antibodies. Almost all substances that act as antigens are foreign proteins.
Antibodies (A blood has B-Antibodies) Antibodies are substances that reacts with the antigen that stimulated its formation. Many antibodies agglutinate (clumping) from reaction to the antibodies.
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