Pseudouridine (abbreviated ?) is the C-glycoside isomer of the nucleoside uridine, and it is the most prevalent of the over one hundred different modified nucleosides found in RNA.^[1] ? is found in all species and in all classes of RNA except mRNA.^[2] ? is formed by enzymes called ? synthases, which post-transcriptionally isomerize specific uridine residues in RNA in a process termed pseudouridylation.^[3]

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fr:Pseudouridine