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MucR is essential for the mucoid colony morphology. Colonies of various P. aeruginosa strains were grown on PIA medium for 24 h. The top row shows the mucoid strain PDO300 and the strains derived from it; the bottom row shows the nonmucoid strain PAO1 and the plasmids derived from it. Plasmids harbored by certain strains are indicated in parentheses.
