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Aminoacyl-tRNA (aa-tRNA), in a ternary complex with elongation factor-Tu and GTP, enters the aminoacyl (A) site of the ribosome via a multi-step, mRNA codon-dependent mechanism. This process gives rise to the preferential selection of cognate aa-tRNAs for each mRNA codon and, consequently, the fidelity of gene expression. The ribosome actively facilitates this process by recognizing structural features...
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