General antimutators are improbable.

Abstract excerpt

Antimutator mutations reduce spontaneous mutation rates, at least at some sites and along some pathways. Antimutators have been found in several microbial systems since their initial discovery in bacteriophage T4, where they occur mainly among mutations of gene 43 (which encodes the viral DNA polymerase). The phage T4 antimutators are highly specific, often strongly reducing mutations rates but only along...

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