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Conditional-lethal mutant

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Conditional-lethal mutant --> conditionally lethal mutant

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: conditional-lethal mutant.