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Structural model of Osu1. The structure was generated using Modeller, based on the solved structure of OtTx1a (PDB: 2n86), and it presents a disulfide pairing of Cys28-Cys40, Cys10-Cys26, Cys19-Cys42, and Cys17-Cys56. The protein alignment between Osu1 and OtTx1a showing residues involve in secondary structure is shown below (T means β-turns and the arrows correspond to the antiparallel β-structure).
