Prevention of a Mental Defect of Phenylketonuria with Serotonin Congeners such as Melatonin or Hydroxytryptophan

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Science  26 Jun 1964:
Vol. 144, Issue 3626, pp. 1593-1594
DOI: 10.1126/science.144.3626.1593


Mice made phenylketonuric from birth until maturity by continuous administration of phenylalanine plus tyrosine had a subnormal maze-learning ability which was largely prevented when serotonin congeners such as melatonin or 5-hydroxytryptophan were administered continuously from birth to maturity. These results were interpreted to mean that the mental failure of experimental phenylketonuria is attributable to the serotonin deficiency imposed by it in infancy.