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UV spectra of 22-mer duplex DNA (top) polydGdCpolydGdC; (middle) polydAdTpolydAdT; and (bottom) polydApolydT in the presence (dashed line) or absence (solid line) of the europium-L-Asp complex in Tris buffer (10 mM Tris, 100 mM NaCl, pH = 7.1). 1:2 ratio of [complex]/[DNA] was used in the experiments. [DNA] = 60 μM in basepair.
