This peptide is as potent as neurotensin itself in the stimulation of amylase secretion. [D- Tyr11]NT and [D-Phe11]NT, in contrast to NT, are resistant to degradation by brain synaptic peptidases. Checler, F; et al., J. Pharmacol. Exp. Ther., 227, 743, (1983); Donoso, M; et al., Br. J. Pharmacol., 87, 483, (1986); Trimble, ER., et al., Gastroenterol., 92, 699, (1987); Ohno, M;, et al., J. Chromatogr. B, 490, 301 (1989).