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The active and pure recombinant forms of human interleukin-1 receptor antagonist (rHIL-1ra) were obtained from inclusion body expressed in Escherichia coli BL21 (DE3). However, the final purified protein was found to be in an unstable reduced form and easily converted to the other forms. Which form of the protein was involved and precisely how this occurred remained obscure. Therefore, we changed...
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