nonself

/ˈnɑnsɛlf/
noun
  1. In biology, any substance or cell that is recognized by the immune system as foreign, such as bacteria, viruses, or transplanted tissue.
    • Vaccines train the immune system to recognize nonself pathogens.
    • Organ transplants are rejected if the body identifies them as nonself.
    • The immune system attacks nonself cells to protect the body.
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