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Figure 1
Three different conformations of B-chain folding in insulin hexamers. One B-chain in each hexamer is highlighted and coloured according to secondary structure. (a) R6 form, residues 1–8 in the B-chain are in helical conformation, which together with residues B9–B19 creates a continuous helical fragment. (b) T3R3f. Residues B1–B3 have an extended conformation, while residues B4–B19 are helical. (c) T6. Residues B1–B8 are in an extended conformation.

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