nonpermissive strain

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mutant — 1. A phenotype in which a mutation is manifested. 2. A gene that is rare and usually harmful, in contrast to a wild type gene, not necessarily generated recently. active m. a m. with overt phenotypic expression. amber m. a m. with a mutation… … Medical dictionary
Permissive temperature — The permissive temperature is the temperature at which a temperature sensitive mutant gene product takes on a normal, functional phenotype.[1] When a temperature sensitive mutant is grown in a permissive condition, the mutated gene product… … Wikipedia

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