| http://www.w3.org/ns/prov#value | - from the group consisting of O, S and N; Y1 is a member selected from the group consisting of OH, a protected hydroxy group and O???P1, wherein P1 is a phosphoramidite or H-phosphonate group; Y2 is a member selected from the group consisting of OH, a protected hydroxy group and O???P2, wherein P2 is a phosphoramidite, H-phosphonate, monophosphate, diphosphate or triphosphate; and B is a modified n
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