| http://www.w3.org/ns/prov#value | - Several particularly preferred rigid linkage structures are provided immediately below: ???C???C???C???C???, S is a spacer which serves to link the rigid linkage L and the label or member of a linkage pair LB/LG. S may add functionality to the nucleoside/nucleotide compounds, or compounds including such nucleotides, such as enhanced nuclease resistance, solubility, transport properties, hybridizat
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