A substance that produces an immune reaction because it is perceived as foreign is a(n)

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A substance that produces an immune reaction because it is perceived as foreign is called an antigen. Antigens can be proteins or other molecules that are not normally found in the body and are recognized as foreign by the immune system. Macrophages and phagocytes are types of white blood cells that help to engulf and destroy foreign substances, but they do not produce an immune reaction on their own. Antibodies are proteins produced by the immune system in response to a specific antigen, and they help to neutralize or eliminate the antigen.

A Substance That Produces an Immune Reaction Because It Is