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The native structures, downloaded from the Protein DataBank, of the three proteins studies. Displayed from left to right are: the hen egg-white lysozyme (1AT5), U. maydis killer toxin kp6 α-subunit (1KP6), and bovine pancreatic ribonuclease A (7RSA). While the bulk of the proteins are in ribbon (β-strand) and cylinder (α-helix) representations, cysteine residues are shown using bond representation.
