Alexopoulos G S, Lieberman K W, Young R C, Shamoian C A
Am J Psychiatry. 1984 Oct;141(10):1276-8. doi: 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.