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Gelation of Ile-Phe dipeptide. (A) Structures of the dipeptides compared in this work. 
-Val-Phe-COO− (upper) and 
-Ile-Phe-COO− (lower). (B) Photograph of 2% (w/v) dipeptide samples under blue light. 
-Ile-Phe-COO− forms a gel (left) whereas 
-Val-Phe-COO− remains in solution (right).
