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Crystal structure of ShK DL-protein racemate. (a), Cartoon representation of the packing of D-ShK (Cyan) and L-ShK (Green) toxin in unit cell in P21/c, unit cell composed of 4 molecules, 2 L-ShK and 2 D-ShK. (b), SigmaA-weighted 2Fo - Fc electron density map at a σ level of 2, showing Tyr23 that derived from the best SHELXS22 solution (CFOM = 0.14).
