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Antiparallel β-sheet with a central Asp17-Gly18 βI’-turn as observed in a recombinant fibritin–foldon fusion protein [PDB code 2IBL (27)]. Hydrogen bonds are indicated by black dashed lines. The same region with d-Phe-Gly turn in the FV-2. Hot═Tap β-turn of FV-1 forming a nearly identical β-sheet that has a flipped amide bond orientation restricting the backbone torsions of a βII’-turn.
