Figure 7: Thermotoga maritima tryptophanyl-tRNA synthetase. Using the “relatedness” translation of “cca” anticodon, cc-P233 and cc-P237 are responsible for the “cc” read-through; ca-H242 and (t) c-S254 plus aa-K253 are responsible for the “ca” read-through; aa-N235 completes the prolines to “cca” read-through; and the codon relatedness ugg-W does not interrupt the read-through. RCSB Protein Data Bank, 2G36.