The invention provides a novel amino acid, neo-tryptophan, as well as polypeptides
containing this novel amino acid such as neurotensin analogs. In addition, the
invention provides neo-tryptophan derivatives, serotonin-like neo-tryptophan derivatives,
and polypeptides containing such derivatives. The invention also provides methods
for making neo-tryptophan, neo-tryptophan derivatives, serotonin-like neo-tryptophan
derivatives, and compositions containing these compounds. Further, the invention
provides methods for inducing a neurotensin response in a mammal as well as methods
for treating a mammal having a serotonin recognition molecule.