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Alginate phenotypes of FRD1 derivatives. (A) The mucoid (Alg+) phenotype on L agar was observed with parent strain FRD1 but not with FRD1050 (Ptrc-algD-A), which has the algD operon repressed by LacIq. (B) The mucoid phenotype on L agar plus IPTG (1 mM) was observed with both FRD1 and FRD1050 (Ptrc-algD-A), which has the algD operon induced.
