Daily oral administration of lead to newborn rats has no adverse effect on their body growth. Lead-treated rats were more active than age-matched controls. Endogenous levels of brain dopamine were unchanged, whereas norepinephrine was increased, suggesting a possible relationship between lead exposure during earliest developmental periods, increased motor activity, and brain norepinephrine, and not brain dopamine as previously postulated.
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Golter et al. (1975) studied this question.
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