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Infectivity of SARSpp chimeras. SARSpp containing S or chimeric S were produced by 293T cells, and the titers were determined on Vero E6R cells as for Fig. 3. Titers of the chimeric S-containing pseudoparticles are shown as percentages of wild-type S-containing pseudoparticles. Columns: 1, mock; 2, Svsv-cyt; 3, Svsv-tmdcyt; 4, Smhv-tmdcyt; 5, Swt.
