Tryptophan: Tryptophan (IUPAC-IUBMB abbreviations: Trp and W) 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 UGG codon.
It is aromatic, apolar and hydrophobic (like phenylalanine). Very fragile, it is destroyed by mineral acids, and cannot be isolated in acid hydrolysates of proteins. It is an amino acid containing an indolent heterocycle...
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