Codons are a linear sequence of three nucleotides in DNA that correspond to a particular amino acid. They are an important part of protein biosynthesis in the cell. The DNA is converted to messenger RNA which in turn is converted in the ribosome to a particular sequence of amino acids to make a protein. The codons denote the specific sequence of amino acids to be put together to make a specific protein. Since there are 4 different nucleic acids in DNA (and RNA), there are 64 different codons available for about 20 commonly used amino acids. As a result, most amino acids are represented by more than one codon. Two amino acids, however, have only one codon to represent them and they are methionine and tryptophan.
Methionine (also the start codon) [Met/M]
See the RNA Codon Table Section.
Look under the inverse table.