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1H NMR spectra of 10 and 40 μM hIAPP free acid at 37 °C in 20 mM sodium phosphate buffer, 50 mM NaCl at pH 7.3 normalized to the number of scans only (A) and normalized to both the concentration and number of scans (B). Inset Strongly shielded peaks previously correlated with oligomer formation.
