1. Cultured human alveolar and peritoneal macrophages have been shown to release thromboxane B2 and leukotriene B4.

2. The release was facilitated by stimulation of the macrophages with opsonized zymosan A (1.2 mg/ml).

3. The release was inhibited in a concentration-dependent manner by incubation of the cells with dexamethasone (1 nmol/l to 1 μmol/l).

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