FIGURE 1.

A comparison of the extent to which tRNA gene sequences are conserved when they are grouped according to the amino acid identity versus the anticodon triplet of the encoded tRNA. (A) The sequences are grouped by the amino acid identity of the encoded tRNA. (B) The sequences for the tRNAs in each amino acid family are separated according to their encoded anticodon triplet. (C) The extent of sequence conservation as a function of the number of different anticodon triplets (isoacceptors) in each amino acid family; Pearson's product moment correlation coefficient, r = −0.851, p < 0.01. Different colors are assigned to each amino acid family, and the colors are consistent across the three panels.