A(n) ___________ is something the immune system recognizes as foreign to the body, while a(n) ____________ is a protein that binds to a specific antigen to alert the immune system.A(n) ___________ is something the immune system recognizes as foreign to the body, while a(n) ____________ is a protein that binds to a specific antigen to alert the immune system.

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Answer:

An antigen is something the immune system recognizes as foreign to the body, while an antibody is a protein that binds to a specific antigen to alert the immune system.