Antibodies bind to specific antigens
Schematic diagram of an antibody and antigens. Light chains are in lighter blue and orange, heavy chains in darker blue and orange. Each antibody binds to a specific antigen; an interaction similar to a lock and key.
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"File:Antibody.svg - Wikipedia, the free encyclopedia."
http://en.wikipedia.org/w/index.php?title=File:Antibody.svg&page=1
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