“Although neither 5-hydroxy-l-tryptophan nor α-methyl-d ,l-tryptophan were able to elicit inward current in PAT2-expressing oocytes both reduced the current evoked by l-proline.”
“ l-Proline uptake was inhibited by 5-hydroxy-l-tryptophan (IC50 1.6 ± 0.4 mM), α-methyl-d ,l-tryptophan (3.5 ± 1.5 mM), l-tryptophan, 1-methyl-l-tryptophan and indole-3-propionic acid.”