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Effect of 15N enrichment and genome G+C content on DNA distribution in CsCl density gradients. Lines indicate the density of unlabeled E. coli DNA (○), 100% 15N-labeled E. coli DNA (•), or unlabeled P. aeruginosa DNA (▵). The genome G+C contents of E. coli and P. aeruginosa are approximately 51% and 67%, respectively.
