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SARS-CoV S palmitoylation is necessary for cell–cell fusion. At 48 h post-transfection, Vero cells expressing SARS-CoV S (A) or SARS-CoV SPN (B) were trypsinized then re-plated. At 24 h post-trypsinization, the number of nuclei per syncytia was counted; the average of 3 independent experiments ± SEM is shown (C).
