title: Regulation by thymus extracts of RNA synthesis in spleen cells "in vitro".
mesh_terms: D000332:Aerobiosis; D002478:Cells, Cultured; D006801:Humans; D066298:In Vitro Techniques; D012313:RNA / Q000096:biosynthesis*; D013154:Spleen / Q000166:cytology / Q000378:metabolism*; D013950:Thymus Gland; D014020:Tissue Extracts / Q000494:pharmacology*
chemical_list: D014020:Tissue Extracts; D012313:RNA