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Furthermore, the elastase inhibitory activity of wild-type serpin B1, but not the C344A variant, was sensitive to oxidation. Thus, wild-type human serpin B1 should be formulated with a pharmaceutically acceptable reducing agent to protect C344 against post-translational oxidative modifications. Alternatively, the C344A variant of this protein may prove to be a suitable drug development candidate. These findings also suggest that inactivation of serpin B1 by oxidation may have a physiological role to play during inflammation. Sedentary