in a series of experiments designed to test further our hypothesis that brain tryptophan and 5-hydroxyindole levels vary post-prandially as a function of the serum tryptophan to competitor ratio ( i.e. , ratio of serum tryptophan concentration to the sum of the concentrations of competing neutral amino acids ) , rats fasted overnight were allosed to consume for two hours single meals containing carbohydrates , fats , and various amino acids : diet 1 contained no amino acids ;
C0301715
neutral amino
C0002520
amino acids