6LOF:
reference: Spectroscopic and Structural Analysis of Cu(2+)-Induced Fluorescence Quenching of ZsYellow., Kim IJ, Xu Y, Nam KH, Biosensors (Basel). 2020 Mar 23;10(3). pii: bios10030029. doi:, 10.3390/bios10030029. PMID: 32210006

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