Figure 15. The structure of the ribosome of Thermus thermophilus showing the small subunit (green), large subunit (blue), mRNA (red) and three tRNAs in the acceptor, peptidyl and exit sites (yellow).

In (A) the new tRNA is delivered to the ribosome by elongation factor EF-Tu (purple). In (B) the amino acid on the incoming tRNA is brought close to the amino acid on the tRNA in the peptidly site to facilitate peptide bond formation (bright green) (Adapted from Goodsell 2010, licensed under CC-BY-4.0 licence).