76 A single g=u base pair is the only element needed for specific binding of tRNAAla and aminoacylation by Ala-tRNA synthetase G●U70 3 76 60 10 5 1 G●U70 30 40 66 Deleted nucleotides 10 (a) (b)A single G=U base pair is the only element needed for specific binding of tRNAAla and aminoacylation by Ala-tRNA synthetase