pineal levels of tryptophan , 5-hydroxytryptophan , serotonin , n-acetylserotonin , melatonin , 5-hydroxyindoleacetic acid and the enzyme activities of n-acetyltransferase and hydroxyindole-o-methyltransferase were determined in male albino rats and syrian hamsters that were injected with insulin twice daily for three days , or injected with streptozotocin to induce diabetes .
C0041249
tryptophan
C0000578
5-hydroxytryptophan