1) Dietary supplement 2) Essential amino acid 3) Essential amino acid 4) Ketogenic amino acid 5) Tryptophane 1) Tryptophane 
==Isolation== The isolation of tryptophan was first reported by Frederick Hopkins in 1901 through hydrolysis of casein. From 600 grams of crude casein one obtains 4-8 grams of tryptophan. == Biosynthesis and industrial production == Plants and microorganisms commonly synthesize tryptophan from shikimic acid or anthranilate. The latter condenses wi...
an amino acid that is nutritionally important and occurs in small amounts in proteins. It is an essential amino acid, meaning that humans and ... [9 related articles]
An essential amino acid. Tryptophan is also the largest amino acid. Its main function is as a building block in protein synthesis. Tryptophan is a precursor for serotonin (a neurotransmitter), melatonin (a neurohormone), and niacin. It is responsible for most of the absorbance of ultraviolet light...
An amino acid with the useful property of aborbing ultraviolet light, helping to make proteins visible to detectors in chromatographs. Some vitamin suppliers call it 'the natural alternative to Prozac'. Tryptophan's biochemical symbol is T and it looks like this: 
An amino-acid in proteins which is essential for optimal growth in infants. It is a precursor to serotonin.
<amino acid> One of the 20 amino acids found in proteins. Essential dietary component in humans. Precursor of nicotinamide. ... (18 Nov 1997) ... 
(trip´to-fan) a naturally occurring essential amino acid that is a precursor of serotonin; adequate levels in the diet may lower the possibility of pellagra by compensating for deficiencies of niacin.
Essential amino-acid
(= Trp; W; 204 D) One of the 20 amino acids found in proteins. Essential dietary component in humans. Precursor of nicotinamide. See Table A2.
(Trp, W) Type: Term Pronunciation: trip′tō-fan Definitions: 1. the l-isomer is a component of proteins; a nutritionally essential amino acid.
Tryptophan: An amino acid, one of the 20 building blocks of protein. A dietary essential amino acid, tryptophan is necessary for optimal growth of children. Bacteria in the intestine break tryptophan down to compounds that largely are responsible for the unpleasant odor of feces. Symbol: Trp.
Tryptophan is a crystalline amino-acid formed in triptych digestion. Its presence in food is essential for an animal's proper growth.
[n] - an amino acid that occurs in proteins
tryptophane noun an amino acid that occurs in proteins; is essential for growth and normal metabolism; a precursor of niacin