| http://www.w3.org/ns/prov#value | - The oligonucleotide can be modified at the base moiety, sugar moiety, or phosphate backbone, and can include other appending groups such as peptides, or agents facilitating transport across the cell membrane (see, e.g., Letsinger et al., PNAS USA 86:6553-6, 1989; Lemaitre et al., PNAS USA 84:648-52, 1987; PCT Publication No. WO 88/09810) or blood-brain barrier (see, e.g., PCT Publication No. WO 89
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