<prompt> Amino acids not coded by triplet codona Lysineb Hydroxyprolinec Selenocysteined Pyrrolysinee Ornithinebeadbcce  <response>: Selenocysteine is 21st AA coded by UGA which is normally a stop codon.Pyrrolysine is 22nd AA coded by UGA which is also a stop codon normally.Lysine is also an essential amino acid so has to be coded by codon AAA, AAG.Hydroxyproline and hydroxylysine are not coded by a codon, i.e. they are not incorporated into protein during translation. Rather, they are formed in protein, by post-translational modification hydroxylation of proline and lysine, respectively.Ornithine is not an amino acid coded for by DNA, and, in that sense, is not involved in protein synthesis. 