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Alveolar macrophages (AM) of male rats (200-250 g), stressed or not, were evaluated with relationship to superoxide production (SP). Plasma levels of corticosterone were measured. The control group showed larger SP than the stressed group in all intervals of time. Exposure in vitro of AM to a synthetic glucocorticoid for 40 min (the same time of restraint stress) inhibits SP. Therefore, it seems under...