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(A) Cryo-EM structure of the Torpedo nAChR (PDB 2BG9). (B) Acetylcholine binding protein (AChBP) from Lymnaea stagnalis, with loops colored that form the principal (A–C) and complementary (D–F) faces of the binding site (PDB code 1UW6). (C) Aromatic box of the AChBP binding site comprising Trp and Tyr residues conserved across nAChRs.
