| http://www.w3.org/ns/prov#value | - B may also be a nucleoside base analog; such analogs are molecules that mimic the normal purine or pyrimidine bases in that their structures (the kinds of atoms and their arrangement) are similar to the normal bases, but may either possess additional or lack certain of the functional properties of the normal bases; such base analogues include, but are not limited to, imidazole and its 2-,4-, and/o
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