Mapping ofochresuppressors inEscherichia coli

Abstract
Genetic mapping of suppressors of theilv-188mutation is described. Suppressors of this mutation have been mapped at fourochresuppressor loci:sup L,sup M,sup Nandsup O. Theochresuppressor described by Brenner & Beckwith is shown not to suppressilv-188whereas thesuppressor described by the same authors suppressesilv-188and may represent the same locus assupOsuppressors. The mapping by P1 transduction of thesup L,sup Mandsup Nloci is described.

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