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Using x-ray crystallography, researchers directly observed the path of mRNA in the 70S ribosome in Fourier difference maps at 7 Å resolution. Image depicts the view down the crystallographic 4-fold axis of the 70S ribosome-mRNA-tRNA complex, showing the head-to-tail juxtaposition of the model mRNAs (red-orange) between adjacent ribosomes.  Read more »