The tryptophan molecule shown in 3-D using Jmol

Tryptophan is an aromatic amino acid.

Like all amino acids, it has an amino group (-NH2) - blue with 2 white balls - at one end, and a carboxylic acid group (-COOH) - grey, connected to red, and red and white - at the other end. Between these is the a- (alpha) carbon to which the 'R' group is attached.

In tryptophan, the 'R' group is rather bulky: a methyl group attached to two joined rings; one of which is a benzene ring.

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Other information

Tryptophan is an essential amino acid found naturally in many foods, and has been available in health food stores as a dietary supplement. However it has been implicated in health scares, possibly due to contamination, so it is no longer available in many countries.

More information from Wikipedia, the free encyclopedia

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