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Overall structure of TbSP1. A, ribbon structure of the TbSP1 sPLA2. The five α-helices of the core catalytic domain are indicated by red labels. Key active site residues Asp126, His147, and Asp148 are rendered in stick representations (CPK-colored); also shown are the N and C termini of the protein. B, electron density map of the active site of TbSP1. Shown is a 2Fo − Fc electron density map of the active site residues contoured at 1.0 σ level.
