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Silver nanoclusters have attracted much research interest because of their unique size-dependent optical,electronic,magnetic,and catalytic properties.Our group has focused on the detection of DNA,Hg2+ and biothiols based on DNA protected silver nanoclusters.We have reported photoinduced electron transfer (PET) between DNA/Ag NCs and G-quadruplex/hemin complexes,accompanied by a decrease in the fluorescence of DNA/Ag NCs.