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Crystal structure of OL_H64F mutant. (A) Overall structure of OL_H64F mutant. The helices are marked by letters A–H. (B) Superimposition of OL_H64F mutant (blue, PDB 8C6O, chain A), wild-type obelin (red, PDB 1QV0), and OL_Y138F mutant (green, PDB 4MRX).
