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An antibody is a protein produced by B-cell lymphocytes of the immune system. It is produced in response to an antigen challenge from the environment, that is abnormal entry into the body. It functions as a sort of targeting device, like the laser dot for a smart bomb. One end of the antibody molecule is specifically shaped to bind tightly against the foreign substance. The other end of the molecule serves as a target for immune system killer cells (T-cell lymphocytes and others) that attack the targeted molecule to disrupt and kill the cell to which the antibody is attached. Antibodies are fantastically specific, and are formed in great variety to attach only to unique sections of the antigen.