title: DNA condensation with polyamines. II. Electron microscopic studies.
mesh_terms: D055598:Chemical Phenomena; D002621:Chemistry; D003090:Coliphages; D004279:DNA, Viral; D008854:Microscopy, Electron; D011073:Polyamines; D013095:Spermidine
chemical_list: D004279:DNA, Viral; D011073:Polyamines; D013095:Spermidine