Abstract
Plasmids are circular DNA molecules that are used as gene vectors in countless applications. They are easy to manipulate and transfer, but can also vary considerably in copy number between individual cells. In this article, a model expression system with a large amount of heterogeneity is presented. We used flow cytometry and digital PCR to count the number of plasmids in sorted sub-populations. Finally, heterogeneity could be attributed to the expression plasmid being either present or absent in bacterial sub-populations.
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