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Pictorial description of the sequential unfolding of the Cro-V55C repressor protein. Two units of the covalently connected dimer (2 N2) form an intermediate complex of two associated dimers (I4) and dissociate into two unfolded dimers (2 U2) connected by a disulfide bridge. This process is fully reversible when refolding is induced. The quaternary structure of I4 (the orientation of the two dimers relative to one another) is currently unknown.
