Question: The first amino acid in a purified bacterial polypeptide is methionine. The start codon in the mRNA is GUG, which codes for valine. Why isnt

The first amino acid in a purified bacterial polypeptide is methionine. The start codon in the mRNA is GUG, which codes for valine. Why isn’t the first amino acid N-formylmethionine or valine?

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