we have evaluated the effect of serotonin ( 5-ht ) and of its biosynthetic precursors 5-hydroxytryptophan ( 5-htp ) and tryptophan ( trp ) on the release of immunoreactive glucagon ( irg ) and insulin ( iri ) from isolated islets and pieces of pancrease of the rat .
C0000578
5-htp
C0041249
tryptophan