conditionally lethal mutant
con·di·tion·al·ly le·thal mu·tant
a viral mutant that can replicate under some (permissive) conditions but not under other (restrictive or nonpermissive) conditions, the parent (wild-type) strain being able to replicate under both conditions. See: suppressor-sensitive mutant, temperature-sensitive mutant.
Synonym(s): conditional-lethal mutant
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