Four micrograms of monoclonal mouse IL-33 antibody (R&D) was intra-peritoneally injected into each mouse 24 h before poly(I:C) infection. Next day, 4 μg of monoclonal mouse IL-33 antibody (R&D) was intra-articularly injected. After 4 h, 20 μl poly(I:C) was intra-articularly injected. Three days later, mice were killed and articular cartilages were collected.
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