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(a) Chemical structures of indolenine squaraine (bold) attached to C6 thymine sequence modifier T*(gray). (b) Schematic representation of immobile four-arm DNA HJs templating squaraine monomer SQ-A, adjacent dimer SQ-BC, transverse dimer SQ-AC, and a tetramer SQ-ABCD. The strands comprising DNA HJ are labeled A, B, C and D.
