Methionine is specified by the codon AUG, which is also known as the start codon. Consequently, methionine is the first amino acid to dock in the ribosome during the synthesis of proteins.

This portion of mRNA is located between the first nucleotide that is transcribed and the start codon (AUG) of the coding region, and it does not affect the sequence of amino acids in a protein ...

This degeneracy provides a layer of protection against mutations, as some mutations in the third nucleotide of a codon may not change the amino acid that is specified. Protein synthesis begins with a ...