seven substituted trnaphes containing uridine , pseudouridine , 3-methyluridine , 2'-o-methyluridine , cytidine , deoxycytidine , and purine riboside at position 33 were assayed for aminoacylation with yeast phenylalanyl-trna synthetase .
C0041984
uridine
C0033846
pseudouridine