What does Trp stand for? R? Amino acid abbreviations are essential to the modern biochemist because they are used in: examining mutations at the protein level, notating protein structure and sequence, bioinformatics applications, calculating chemical properties of proteins (such as extinction coefficient), and much more.
Source: http://www.ncbi.nlm.nih.gov/Class/MLACourse/Modules/MolBioReview/iupac_aa_abbreviations.html
