title: Evidence for the presence of ribonucleotides at the 5' termini of some DNA molecules isolated from Escherichia coli polAex2.
mesh_terms: D002499:Centrifugation, Density Gradient; D055598:Chemical Phenomena; D002621:Chemistry; D004269:DNA, Bacterial / Q000302:isolation & purification; D004926:Escherichia coli / Q000032:analysis*; D008970:Molecular Weight; D012329:RNA, Bacterial; D012265:Ribonucleotides / Q000032:analysis*
chemical_list: D004269:DNA, Bacterial; D012329:RNA, Bacterial; D012265:Ribonucleotides