The question of natural selection against mutable-to-terminator codons.

Abstract excerpt

Codons that differ from a terminator triplet by only a single base are sometimes thought, because of their greater risk of undergoing a harmful mutation, to be kept at a reduced frequency by natural selection. The present study on human genes shows that these codons are infrequent, but their low frequency is not directly related to their risk of mutation to terminator. Rather, it is a consequence of their ending...

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