Figure 3From: Plasmid selection in Escherichia coli using an endogenous essential gene markerPlasmid production of pFab transformants. (A) Agarose gel electrophoresis of total DNA isolated from five clones of pUC19 and pFab. Bands were quantified by using ImageQuant software to calculate ratio of pDNA to gDNA as a measure of copy number in pUC19 and pFab. (B) Mean ratios of pDNA:gDNA of pUC19 and pFab from (A).Back to article page