title: [Origin of the diversity of the immune system].
mesh_terms: D000818:Animals; D004261:DNA Replication; D006801:Humans; D007136:Immunoglobulins / Q000235:genetics; D008285:Major Histocompatibility Complex; D011948:Receptors, Antigen, T-Cell / Q000032:analysis* / Q000502:physiology; D013601:T-Lymphocytes / Q000276:immunology*
chemical_list: D007136:Immunoglobulins; D011948:Receptors, Antigen, T-Cell