title: Two signal models of lymphocyte activation?
authors.forename: R E
authors.initials: RE
authors.lastname: Langman
authors.forename: M
authors.initials: M
authors.lastname: Cohn
mesh_terms: D000938:Antigen-Presenting Cells / Q000276:immunology; D015496:CD4-Positive T-Lymphocytes / Q000276:immunology; D006801:Humans; D008213:Lymphocyte Activation / Q000276:immunology*; D008954:Models, Biological; D015398:Signal Transduction / Q000276:immunology*; D013601:T-Lymphocytes / Q000276:immunology