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Structures and base pairing of uridine and pseudouridine. In pseudouridine, uracil is linked to ribose via C5 instead of the N1 linkage found in uridine (C5 and N1 are indicated in bold type). Hydrogen bonds between adenosine and uridine or pseudouridine are indicated by dotted lines. Additional hydrogen bonding potential of pseudouridine is indicated by dashed arrow.
