2, 4, 6-trinitrobenzene sulfonic acid and sulfasalazine were bought from MP Biomedical (Aurora, OH, United States) and Yifeng Pharmacy (Nanjing, China), respectively. ELISA kits (IL-6, IL-1β, IFN-γ, and TNF-α) were purchased from Nanjing Jiancheng Bioengineering Institute Co., Ltd. CP were prepared according to our previous methods (Schicho et al., 2010 (link); Tao et al., 2017 (link)).
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