| http://www.w3.org/ns/prov#value | - In addition, the pentose and nucleoside structures may also contain additional groups, such as protecting groups, at any position, for example as needed during synthesis. [0303] In addition, the base may contain additional modifications as needed, i.e. the carbonyl or amine groups may be altered or protected. [0304] In an alternative embodiment, the attachment is any number of different Z linkers,
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