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(a) Monovalent cations do not affect the geometry of ssDNA. The underlying linker monolayer keeps its ordered conformation. (b) Divalent cations induce ssDNA deformation and the deformation perturbs the linker monolayer. (c) Hybridization in the presence of divalent cations does not introduce further disruption to the linker monolayer structure. Reprinted with permission from ref. 164. (2008 American Chemical Society)
