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Aim: TNF-α has been proved as a therapeutic target for rheumatoid arthritis.However, the cost of anti-TNF-α biologic agents is considerable and unacceptable at present.Here, a high level expression system of anti-TNF-α monoclonal antibody (mcAb) was constructed in dihydrofolate reductase-negative Chinese hamster ovary (CHO/DHFR-) cells.