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Stability of oligo(dT9) and mixmers with ENA or 2′,4′-BNA/LNA residues in rat plasma. Closed circles, 5′-TTTTTTTTT-3′, where T is 2′-O,4′-C-ethylene thymidine; open diamonds, T is 2′-O,4′-C-methylene thymidine; open squares, natural DNA oligo(dT9).
