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Recombinant human cyclooxygenase 2 (Cox 2) was expressed in stably transformed Drosophila melanogaster S2 cells, and was present primarily in the cellular fraction at a molecular weight of 70 to 74 kDa. Recombinant Cox 2 was purified using Ni2+-affinity fractionation to a specific activity of 24 800 U mg−1 protein. The peak level of recombinant Cox 2 production was 1.6 μg (107 cells)−1, seven days...
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