title: Electron microscopy of the replicative form DNA of coliphage fd.
mesh_terms: D002499:Centrifugation, Density Gradient; D003090:Coliphages / Q000032:analysis*; D004261:DNA Replication; D004279:DNA, Viral / Q000032:analysis*; D008854:Microscopy, Electron
chemical_list: D004279:DNA, Viral