Acetaldehyde at physiologically incompatible concentrations had a marked effect and ethanol an insignificant effect on monoamine oxidase activity. Neither inhibited the activity of catechol-O-methyl tansferase or the uptake of norepinephrine by synaptic vesicles; they also had little effect on 5-hydroxytryptophol synthesis in the brain.
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Lahti et al. (1974) studied this question.