Abstract
The immune system of mammals evolved to discriminate between self- and nonself-antigens. This assures protection from foreign pathogens without eliciting autoimmunity. The process of self/nonself discrimination is primarily acquired via positive and negative selection of T cells during ontogeny in the thymus. Thymic tolerance to self-antigens, however, is not absolute and several peripheral mechanisms have also evolved to reinforce tolerance to self-antigens and promote immunity to foreign antigens.
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Shirwan, H., Ildstad, S.T. (2001). Hematopoietic Stem Cell Chimerism and Tolerance Induction. In: Thomson, A.W. (eds) Therapeutic Immunosuppression. Immunology and Medicine Series, vol 29. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-0765-8_8
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