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Platelet MAO activity and age at onset of depression in elderly depressed women

Published Online:https://doi.org/10.1176/ajp.141.10.1276

Platelet monoamine oxidase (MAO) activity was assayed in 38 elderly depressed women and 16 matched controls. The depressed women whose illness began at age 55 or earlier (N = 19) had significantly lower MAO activity than patients with later onset (N = 19) or controls.

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