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Our finding of low IL-2 production in neuroleptic-native schizophrenic patients confirms that this finding is not confounded by medications. The correlation of low IL-2 production with younger age at onset suggests that this may be a marker for a subtype of the illness or for severity.

A case-control association study was conducted among patients with schizophrenia (DSM-III-R, n = 141) and unaffected controls (n = 177) of Caucasain and African-American ethnicity. No significant differences in the distribution of a dinucleotide repeat polymorphism in the neurotrophin-3 (NT-3) gene were noted between the two groups. This study does not support an association between schizophrenia and the NT-3 gene locus in a United States cohort.

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