title: Isolation of RNA using guanidinium salts.
mesh_terms: D000818:Animals; D002478:Cells, Cultured; D002499:Centrifugation, Density Gradient / Q000379:methods; D003001:Cloning, Molecular / Q000379:methods*; D019791:Guanidine; D006146:Guanidines; D007202:Indicators and Reagents; D012313:RNA / Q000302:isolation & purification*
chemical_list: D006146:Guanidines; D007202:Indicators and Reagents; D012313:RNA; D019791:Guanidine