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Features of the mature β-lactoglobulin (BLG) structure. (A) Cartoon representation of BLG and its nine β-strands, i.e., A to I, connected by seven significant loops. (B) Crucial residues of BLG; protonation of E89 triggers the Tanford transition; W19, the “reporter” for structural alterations; C119, C106, C160, and C66 forming disulfide bonds; C121 hidden beneath the main α-helix. The internal hydrophobic cavity, i.e., the central calyx, is represented with a dashed black circle.
