<prompt> All are aromatic amino acids EXCEPT:PhenylalanineTyrosineTryphophanLysine  <response>: Lysine: Ref 49, U.S. 75- R.S. 7th Aromatic amino acids: Phenylalanine, tyrosine and tryptophan with indole ring are aromatic amino acids, Basides these histidine may also be considered this category. Hydroxyl group containing amino acids: - Serine, Threonine, Tyrosine Amino acids with aliphatic side chains: - Leucine, Isoleucine, Valine Branchedchain amino acids Glycine, Alanine Basic amino acids: - Lysine, Arginine with guanidine group and Histidine imidazole ring Non polar amino acids: - Alanine, laucine, Isoleucine, Valine, Methionine, Phenylalanine, tryptophan and proline 