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Representation of RNA secondary structure in a region of SARS-CoV-2 as a contour plot. Predicted consensus positions of terminal loops are assigned depths of zero, numbers of sequential pairings in duplex regions plotted on the z axis as depths in a 3-dimensional plot (A) and as a color-coded 2-dimensional plot (B). The predicted RNA structure corresponds to a short region of the ORF-3a gene of SARS-CoV-2 analyzed in Fig. 5 to 7.
