| http://www.w3.org/ns/prov#value | - B.sup.11 is a ligand and represents one of bases of natural nucleic acids (i.e., A, T, C, G, I, or U) or its analogue. B.sup.11 is bonded through the 9th position in the case that the base is a purine base such as adenine, guanine or inosine,
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