Fig. 1

A Thermally induced transfer curve of DNA double-strands with C-C mismatch(reproduced with permission from Ref. [21],© Chem Commun 2008). B In the presence of Ag⁺, RNA forms a local structure of C-Ag⁺-C(reproduced with permission from Ref. [22],© Angewandte Chemie 2015). C N3-Ag⁺-N3 structure observed in Ag⁺-RNA complex(reproduced with permission from Ref. [23],© Chemistry 2016). D possible isomerized structure(reproduced with permission from Ref. [23],© Chemistry 2016). E AFM observation of the structural changes of double-stranded DNA on the DNA origami frame in the Ag⁺ solution. Yellow Arrows indicate connected strands(X-shape formation), Blue Arrows indicate separated shape.(reproduced with permission from Ref. [24],© Chemistry 2019)