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Comparison of the RNA and protein catalytic sites for the Diels-Alder reaction. The surface of the bound ligand is in mesh representation. (a) Catalytic pocket from the Diels-Alder ribozyme–product complex. (b) Catalytic pocket of the antibody catalyzing the retro-Diels-Alder reaction41 (PDB entry 1LO2). Anchoring of the ligand is achieved through direct and water-mediated (W127) hydrogen bonds.
