title: A discussion of immune tolerance and the layered immune system hypothesis.
authors.affiliation: Department of Cell and Molecular Biology; Karolinska Institutet; Stockholm, Sweden.
authors.forename: Jeff E
authors.initials: JE
authors.lastname: Mold
authors.forename: Colin C
authors.initials: CC
authors.lastname: Anderson
mesh_terms: D000818:Animals; D046528:Chimerism; D047109:Fetal Development / Q000276:immunology; D005333:Fetus / Q000276:immunology; D006801:Humans; D007107:Immune System / Q000502:physiology*; D007108:Immune Tolerance; D017634:Self Tolerance; D013045:Species Specificity; D050378:T-Lymphocytes, Regulatory / Q000276:immunology*; D014181:Transplantation Immunology; D023001:Transplantation Tolerance
keywords: chimerism; fetus; hematopoietic stem cell; tolerance