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Peppermint oil (A) and spearmint oil (B) influenced the production of interleukin 1 beta (IL1-β; pictogram per milliliter) from porcine alveolar macrophages (PAMs) in the absence or presence of lipopolysaccharide (LPS). Cells were incubated with various concentrations (0, 25, 50, 100, 200 μg/mL) of each essential oil extract in the presence or absence of LPS (1 or 0 μg/mL) for 24 h. The results were means of values from 6 pigs.
