> There is nothing wrong with tryptophan - but there is something wrong with
> the genetic engineering that allowed this disaster to happen...
not so sure. Check out the following paper.
Supraphysiologic l-Tryptophan elicits cytoskeletal and macromolecular
permeability alterations in hamster small intestine epithelium in vitro.
J. Clin Invest. vol 87 pp454-462