in tests with determination of pain reaction in rats registered by their squeak and arising in reponse to a single electric irritation of the tail evidence was obtained to the effect that substances both lowering the serotonin content in the brain ( p-chlorphenylalanine , reserpine ) and raising it ( 5-oxytryptophan , pargilin ) cause a fall of the threshold , viz .
C0423896
content
C0006104
brain