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The hydrophobicity of the hydroxy-modified acbcPNA decreased with the number of hydroxy groups added as indicated by the decrease in the logP values. Only two modifications were sufficient to decrease the logP by an order of magnitude without excessively lowering the binding affinity nor the specificity. This work thus demonstrated that the specific structural modifications for this type of PNA model can be performed in a modular fashion, which paves the way toward the future realization of improving hydrophilicity and nucleic acid bind