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Answer : Antigens
They alert the body when there is an infection in your body. A good example of a Antigen is a common cold. Once a Antigen is spotted, the immune cells let out antibodies to help fight off the antigens.
They alert the body when there is an infection in your body. A good example of a Antigen is a common cold. Once a Antigen is spotted, the immune cells let out antibodies to help fight off the antigens.