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The diversity of chemical groups introduced enzymatically during the process of RNA maturation at various locations of the four common ribonucleosides A, G, C and U linked via 5′- to 3′-phosphodiester bonds. Only conventional acronyms/symbols are shown. The complete scientific names of all modified nucleosides presented in this figure are provided in the MODOMICS database. Nucleosides in RNA can also be doubly or triply modified by the introduction of several of these chemical groups.
