“Indomethacin (5 mM), phenylbutazone (5 mM), and salicylate (15 mM) prevent the active transport of the amino acid, L-tryptophan , across the small intestine of the rat.”
“ Salicylate (15 mM) significantly inhibits the active transport of L-tryptophan across the hamster small intestine; aspirin (15 mM) has no inhibitory effect.”