Methionine: nf Methionine (abbreviations IUPAC-IUBMB: Met and M) is an α-amino acid whose L enantiomer is one of the 22 proteinogenic amino acids, and one of the 9 essential amino acids for humans. It is encoded on messenger RNAs by the AUG codon. It is characterized by the presence of a sulfur atom engaged in a thioether function. Its methyl group –CH3 is involved in many metabolic methylation reactions ....
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