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A portion of the 1H-1H EXSY spectrum collected on Fe(II) PPDME GlbN-A at pH 9.3 with a mixing time of 5 ms. The upfield peaks arising from the coordinated Lys42 CδH2 and CεH2 protons have exchange cross peaks with their decoordinated counterparts at 1.7 and 3.1 ppm.
