Tryptophan
From FoldIt Wiki
Tryptophan is one of the more hydrophobic Amino acids. Its shape is unique on Foldit.
More information can be found at http://en.wikipedia.org/wiki/Tryptophan
Vijay Pande of Folding@home wrote a piece on tryptophan on his blog http://folding.typepad.com/news/2007/11/on-turkey-and-t.html

