the effects of serotonin precursors ( l-5-hydroxytryptophan and l-tryptophan , with or without mao inhibitors ) and of agonists ( quipazine and 5-methoxy-n , n-dimethyltryptamine-meo-dmt ) were studied in 3 day rem-deprived or control rats , by recording the presence of the serotonin syndrome and the number of head shakes .
C0000578
l-5-hydroxytryptophan
C0041249
l-tryptophan