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nonself-antigen

or non·self an·ti·gen

[non-self-an-ti-juh n, -jen]
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noun Immunology.
  1. any of the antigens present in an individual that originate outside the body (contrasted with self-antigen).
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018