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Comparison of the impact of epinephrine (Epi) versus metaproterenol (MP) on lung tumor retention in mature male and female F344 rats. The significant male-female difference in the MP-induced increase in tumor retention was also evident in epinephrine injected animals. Error bars are SEM. The number above the MP and epinephrine bars indicates the magnitude of the respective effects compared to the sex-matched saline injected group.
