| http://www.w3.org/ns/prov#value | - In all of the foregoing embodiments, an X residue can also be a non-naturally occurring nucleotide, or a nucleotide analog, such as those described herein. [0083] A modified base is any base which is chemically distinct from the naturally occurring bases typically found in DNA and RNA such as T, C, G, A, and U, but which share basic chemical structures with these naturally occurring bases.
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