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A view of the “side pocket” found at the side of the COX-2 active site. The COX-2–selective inhibitor SC-558 is shown in blue, bound in the active site. Protein residues are shown as van der Waals spheres; valine 434 and valine 523 are shown in pink. In COX-1, both these residues are isoleucines; the additional bulk contributed by the two extra methyl groups is sufficient to close down this small alcove so that no side pocket is found in COX-1.
