The blood of rats was collected and centrifuged at 684 g for 10 min at 4 °C to obtain serum. TNF-α, IL-1β, CRP and IL-6 are bio-markers of lung and systemic inflammation. Levels of TNF-α and IL-1β in BALFs as well as CRP and IL-6 in serum were determined by ELISA according to the instructions supplied by the kit’s manufacturer.
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