title: A comparative study of RNA fractions mediating delayed sensitivity to a chemically defined antigen in vitro.
mesh_terms: D000818:Animals; D001483:Base Sequence; D002499:Centrifugation, Density Gradient; D002845:Chromatography; D006168:Guinea Pigs; D006968:Hypersensitivity, Delayed; D007116:Immunization, Passive; D008198:Lymph Nodes / Q000276:immunology; D012313:RNA / Q000032:analysis / Q000276:immunology* / Q000302:isolation & purification; D013154:Spleen / Q000276:immunology
chemical_list: D012313:RNA