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Dipyrrin‐embedded cGHK peptide 1 a as a selective Zn2+ sensor in aqueous buffer HEPES. a) The fluorescence titration of 1 a with Zn2+. b) The fluorescent responses of 1 a toward various metal ions. c) The changes in NMR spectrum of 1 a upon the addition of Zn(OAc)2.
