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Top panel: The Tt ba3 CuB–CO transient photoproduct (PDB 3QJR, 49). Lower panel: The bovine CuB–CO transient photoproduct (PDB 3AG2, 55). In both panels, the left figure (Top) is viewed from the positive side of membrane, while the right figure (Side) is viewed from the ligand entrance channel. The “Side” view is generated from the “Top” by a left-handed 90° rotation about the horizontal axis.
