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OxsA has a globular fold composed entirely of α-helices. (A) Stereoview of OxsAOXT-P. (B) Stereoview of OxsAOXT-PP. (C) Stereoview of OxsAOXT-PPP. Each stereo figure is shown with a 2F(o)–F(c) simulated annealing composite omit electron density map contoured at 1.0 σ around the bound OXT substrate.
