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Phantom images of [Ni(NOPE)]2+ on a 4.7 T MR scanner. Center contains only 20 mM HEPES,100 mM NaCl. Concentration of [Ni(NOPE)]2+ varies: D1 2mM, D2 4mM, and D3 8 mM with 20 mM HEPES pH~ 7.4, 100 mM NaCl at 37º C. Reprinted with permission from reference [25].
