Mouse macrophage cell line J774A.1 was obtained from the Kunming Cell Bank of Type Culture Collection Chinese Academy of Sciences (Kunming, China). The cells were maintained in complete DMEM medium (containing 10% FBS, 100 µg/ml penicillin, 100 µg/ml streptomycin, and 2 mM l-glutamine) and cultured at 37°C in a humidified incubator with 5% CO2. The cells were subcultured every 2–3 days.
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