Christian B. Anfinsen investigated the relation between amino-acid sequence and protein folding. Refolding experiments connect recovery of a protein's native structure with recovery of its biological activity.
The work supports the thermodynamic interpretation of folding under appropriate conditions: sequence and environment constrain the accessible stable structure. It does not imply that every protein folds rapidly or independently of cellular assistance.[ref]
Figure 1. . Edward A. Hubbard / National Institutes of Health, circa 1950s; courtesy NIH Record and NIH, via the National Library of Medicine. Public domain (PD-USGov-NIH). Source.

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