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Electron density maps for the bound substrates. A, 18EtBV in PcyA at 1.48 Å; B, BV13 in PcyA at 1.04 Å; C, BV in the E76Q mutant protein at 1.40 Å. The Fo − Fc maps contoured at the 4 σ level are superposed on the stick models of the bound substrates. The figure was prepared with PyMOL (49).
