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Mutants of Escherichia coli deficient in the periplasmic enzyme 2':3'-cyclic phosphodiesterase have been obtained. The gene, designated cpdB, was mapped by conjugation and transduction and found to be located about 0 . 11 min to the right of the cycA locus on the E. coli genetic map.
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Beacham et al. (1980) studied this question.
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