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Orientation of epibatidine bound to Aplysia AChBP (PDB code 2BYQ; Ref. 110). Left: principal and complementary faces are shown as ribbons, while epibatidine is shown as space-filling. Right: residues of closest approach in AChBP are shown as space-filling (Trp143, Tyr185, Tyr192, Trp53, Met114) and epibatidine as ball and stick.
