Tryptophan is an essential amino acid that must be obtained from the human diet. It has the single amino acid code W (see single letter amino acid codes) and the 3 letter code Trp. It is coded for in the genome by the nucleotide base sequence UGG .
Tryptophan is also a drug which is used to treat depression, when other antidepressants have been otherwise uneffective.
Berg, J. M., Tymoczko, J. L., & Stryer, L. (2002). Biochemistry (5th ed.). New York: W.H. Freeman.
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