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Q Ribonucleoside

A modified nucleoside which is present in the first position of the Anticodon of tRNA-Tyrosine, tRNA-Histidine, tRNA-Asparagine and tRNA-Aspartic Acid of many organisms. It is believed to play a Role in the regulatory function of tRNA. Nucleoside Q can be further modified to nucleoside Q*, which has a Mannose or Galactose moiety linked to position 4 of its cyclopentenediol moiety.