Antibodies are a type of protein. They are produced by the immune system in response to foreign substances that may be a threat to the body - such as chemicals, virus particles, spores, or bacterial toxins. These foreign substances are called antigens.

Each type of antibody is unique and defends the body against one specific type of antigen.

Johns Hopkins patient information

Last revised: December 7, 2012
by Mamikon Bozoyan, M.D.

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