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A protease was purified from the culture medium of Clostridium botulinum serotype C strain Stockholm (C-St). The purified protease belonged to the cysteine protease family based on assays for enzyme inhibitors, activators and kinetic parameters. The protease formed a binary complex consisting of 41- and 17-kDa proteins held together non-covalently. The DNA sequence encoding the protease gene was shown...
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