Acetylcholine receptor (nicotinic) from electric torpedo rays (very similar to human receptor) is made of 5 subunit, 2 of which (shown in orange) binds to ACh (red) (PDB code: 2bg9)

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Acetylcholine receptor (nicotinic) from electric torpedo rays (very similar to human receptor) is made of 5 subunit, 2 of which (shown in orange) binds to ACh (red) (PDB code: 2bg9)