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In substrate activate phase, an additional substrate ATCh molecule binds with the peripheral anionic site of BChE and interacts with the QM part of BChE by electrostatic interaction. Atoms of the QM part are rendered in balls and sticks. Atoms of the additional ATCh and Asp70 (D70) in the peripheral anionic site are rendered in sticks. Other atoms of BChE are rendered in cartoon of lines. See caption of Figure 1 for the color codes for different types of atoms.
