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Protein detection with hyperpolarized 129Xe MRS. A xenon-binding cryptophane with a p-benzenesulfonamide ligand (right) can noncovalently bind to carbonic anhydrase IX (left). The binding causes a 3.2 ppm shift in the 129Xe MR spectrum, from 63.7 ppm for the unbound agent to 66.9 ppm for the bound agent (center). Reproduced with permission from reference (101).
