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Dependence of peptide assembly state on the temperature. (A) Disassembly of 1.5% (w/v) (solid squares) and 2% (w/v) (solid circles) 
-Ile-Phe-COO− dipeptide upon heating. Reassembly of 2% (w/v) 
-Ile-Phe-COO−dipeptide upon cooling (open circles). No changes in absorbance were observed upon heating a 2% (w/v) 
-Val-Phe-COO− sample (solid triangles). (B) 1H NMR spectra of 
-Ile-Phe-COO− (left) and 
-Val-Phe-COO− (right) at increasing temperatures.
