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NiV G stalk residues 181 to 182 are required for activation of NiV F. Cell-to-cell fusion mediated by the chimeric NiV-NDV proteins with NDV F (A) or with NiV F (B) compared to the NDV HN/F (A) or NiV G/F (B) proteins. Fusion is measured by a β-Gal complementation assay. The values are means (± the standard errors) of results from four experiments. **, P < 0.05; ***, P < 0.005 (one-way analysis of variance, Dunn's multiple-comparison test).
