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Representative CD spectra of TBA (solid line) and UNA-modified aptamers characteristic of the three groups: U3, U7 and U12 (dashed line: U7); G1, U4, G8, U9 and U13 (dotted line: U13); G2, G5, G6, G10, G11, G14 and G15 (dash-dotted line: G14). For individual CD spectra see ‘Supplementary Data’.
