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The unfolding and refolding reaction of myoglobin was examined in solution and within a porous silica sol-gel glass. The sol-gel pores constrain the protein to a volume that is the same size and shape as the folded native state accompanied by a few layers of water solvation. Denaturants such as low pH buffers can be diffused through the gel pores to the protein to initiate unfolding and refolding...