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Codon Degeneracy

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Codon degeneracy means most amino acids are specified by more than one codon, so the genetic code maps 61 sense codons onto only 20 amino acids.

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Leucine is specified by six different codons, while methionine is specified by only one.

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Degeneracy means multiple codons can specify the same amino acid — no single codon specifies more than one amino acid.