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Aim: To examine the effects of rhTNFR:Fc on disease progression, joint inflammation, bone destruction and the production of inflammatory mediators in a rat model of adjuvant induced arthritis (AA).Methods: AA was induced by complete Freund adjuvant.AA rats with experimental arthritis were randomly separated into different groups and then treated with rhTNFR:Fc (1, 3, and 9 mg/ kg), or IgG-Fc (9 mg/kg), subcutaneously after immurization every 3 d for a total of 15 d.