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Published Online:https://doi.org/10.1176/ajp.130.7.754

An enzyme capable of forming the hallucinogen dimethyltryptamine was found in human red blood cells, plasma, and platelets. The enzyme activity in red blood cells and plasma was not significantly different in psychiatric patients from that in normal subjects. The enzyme activity in platelets was higher in psychotic subjects than in nonpsychotics and was apparently related to the presence of a dialyzable inhibitor in the normal subjects.

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