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New regulatory gene for pectate lyase (Pel) production of Erwinia chrysanthemi strain EC16 was searched by observing the gene dosage effect of each cosmid library in Pel production. From this survey, a cosmid clone, p5A, had reduced in Pel production under both inducing and non-inducing conditions and caused less tissue maceration of potato tubers. The 2.64-kb HindIII fragment from p5A was found to...
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