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(a) Spectra of 5PC in DMPG (0.5 mol %) hydrated with 10 mM solutions of MgSO4, NiSO4, or Ni(ClO4)2. (b) Spectra of 5PC in DMPG (0.5 mol %) in the presence of 10 mM NiSO4 or Ni(ClO4)2 and 2 M NaCl. (c) Broadening of different n-PC spin-labels in DMPG membranes without NaCl (see (a)) in the presence of 10 mM NiSO4 or Ni(ClO4)2.
