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Backbone hydrogen-bonding pattern observed between antiparallel β-strands 2 and 3 in Cp-CutA1 (PDB entry 4e98), highlighting the Pro48–Ser49 wide β-bulge (orange circle) in β2. Interstrand hydrogen bonds are indicated by dashed black lines and the main-chain backbone atoms are colored as follows: oxygen, red; nitrogen, blue; carbon, yellow.
