title: SV 40 nucleoprotein complexes: structural modifications after isopycnic centrifugation in metrizamide gradients.
mesh_terms: D002500:Centrifugation, Isopycnic / Q000379:methods; D004279:DNA, Viral / Q000032:analysis / Q000302:isolation & purification*; D003852:Deoxyribonucleoproteins / Q000032:analysis / Q000302:isolation & purification*; D007463:Iodobenzoates; D008793:Metrizamide; D008854:Microscopy, Electron; D008970:Molecular Weight; D009698:Nucleoproteins / Q000302:isolation & purification*; D013539:Simian virus 40; D014764:Viral Proteins / Q000032:analysis / Q000302:isolation & purification*
chemical_list: D004279:DNA, Viral; D003852:Deoxyribonucleoproteins; D007463:Iodobenzoates; D009698:Nucleoproteins; D014764:Viral Proteins; D008793:Metrizamide