COVER Crystal structures of the 70S ribosome from the bacterium Thermus thermophilus in complex with translation elongation factors Tu (EF-Tu) and G (EF-G). During protein synthesis, EF-Tu (in periwinkle blue, center) delivers an aminoacyl transfer RNA (green) to the ribosome for each amino acid indicated by the messenger RNA. As the polypeptide chain grows, EF-G (in green at top right) helps move the mRNA and tRNAs through the ribosome. See pages 688 and 694. Image: Larissa Ulisko, Rebecca Voorhees, Martin Schmeing

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