title: Dimers of escherichia coli F' factors.
mesh_terms: D002499:Centrifugation, Density Gradient; D004269:DNA, Bacterial / Q000302:isolation & purification*; D004270:DNA, Circular / Q000302:isolation & purification; D004926:Escherichia coli; D008970:Molecular Weight; D013395:Sucrose; D014316:Tritium
chemical_list: D004269:DNA, Bacterial; D004270:DNA, Circular; D014316:Tritium; D013395:Sucrose