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The genetic code structure in the RNA format in a radial representation. Chart from inside to outside: a triplet of mRNA (5′→3′) is assigned to one of the 20 canonical amino acids or a stop codon. The natural expansion of the genetic code of selenocysteine (SeC) at opal and pyrrolysine (Pyl) at the amber and opal stop codons is depicted (Courtesy provided by Dr Stefan Oehm) (Oehm, 2016).
