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Effects of adult nicotine administration and withdrawal on cardiac norepinephrine levels. Treatment took place from 90 to 107 days of age via the infusion route. Data represent means and standard errors of 12 animals for each sex at each age. ANOVA appears at the top of the panel; asterisks denote age points at which the nicotine group differs significantly from the corresponding control. Abbreviation: NS, not significant.
