FIGURE 1.
Modified wobble uridines present in yeast tRNA reading twofold degenerate codon boxes (Fig. 2). 5-methylcarboxymethyl-2-thiouridine (mcm5s2U), 5-methylcarboxymethyl-uridine (mcm5U), and 5-carbamoylmethyl-2′-O-methyluridine (ncm5Um).
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