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Effect of ParB1 on growth of E. coli carrying parS1 plasmids. The cells had either an empty vector (pGB2) or the same vector carrying the parS1-1 site (pGB2parS1-1). The cells also had another plasmid (pBJH15) carrying the parB1 gene under the control of an IPTG-inducible promoter. Cells were grown on LB agar plates with or without IPTG, under drug selection for both plasmids.
