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Otto Benkert; Adelheid Renz; Claudia Marano; Norbert Matussek

Arch Gen Psychiatry. 1971;25(4):359-363.

Abstract
The tyrosine plasma concentration of 38 endogenous depressives was compared with that of neurotic depressives, schizophrenics, and healthy controls at 8 AM, 11 AM, 2 PM, and 5 PM. The 8 AM tyrosine concentration was about equal in all groups, but there was a significant decrease of the tyrosine level at 11 AM in endogenous depressives, as compared with the other three groups. The possible causes and the consequences of this tyrosine decrease are discussed.

Author Affiliations
Munich, West Germany

From the Neurochemistry Division, Max Planck Institute for Psychiatry, Munich, West Germany. Dr. Benkert is currently at the University of Munich.

Footnotes
Accepted for publication Feb 22, 1971.

Reprint requests to Nervenklinik der Universitat Munchen, 8 Munchen 15, Nussbaumstrasse 7, West Germany Dr. Benkert).

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