title: Remembering things past.
mesh_terms: D056704:Adaptive Immunity / Q000276:immunology*; D000818:Animals; D001402:B-Lymphocytes / Q000276:immunology*; D006801:Humans; D007156:Immunologic Memory / Q000276:immunology*; D007694:Killer Cells, Natural / Q000276:immunology; D013601:T-Lymphocytes / Q000276:immunology*; D014611:Vaccination; D014612:Vaccines / Q000276:immunology
chemical_list: D014612:Vaccines