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Expression of lacZ from the ORF1 promoter of pCP1. Transconjugants of F. psychrophilum containing the lacZY genes inserted into the SphI site of pCP23 downstream of the ORF1 promoter were grown on EAOS agar containing X-Gal. 1, F. psychrophilum THC02-90-p; 2, F. psychrophilum THC02-90-β.
