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| Figure 2: Chemical structures of some nucleotide analogs. The sugar ring is absent in acyclovir and gancyclovir, is arabinose instead of ribose in AraC, AraA and fludarabine, 2-deoxyribose in cladrine and contains an halogen, either in the sugar (clofarabine) or the base (cladribine, fludarabine, clofarabine). |
