Figure 3: 1% agarose gel tracing the large-scale purification of pBGS19Luxwt plasmid DNA. Anion-exchange chromatography is commonly used for final purification of plasmid DNA 13. It was found that ...

A plasmid is a small, circular, double-stranded DNA molecule that is distinct from a cell's chromosomal DNA. Plasmids naturally exist in bacterial cells, and they also occur in some eukaryotes.