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Meaning of nonself-antigen

non•self-an•ti•gen

Pronunciation: (non-self'an"ti-jun, -jen"), [key]
— n. Immunol.
  1. any of the antigens present in an individual that originate outside the body (contrasted with self-antigen).
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.