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Chimeric receptor binding proteins with NDV globular heads mediate fusion promotion. Cell-to-cell fusion mediated by the chimeric HPIV3-NDV protein with HPIV3 F (A) or chimeric NiV-NDV protein with NiV F (B), compared to the HPIV3 HN/F (A) or NiV G/F (B) proteins. Fusion is measured by a β-Gal complementation assay. The values are means ± SD of results from samples assessed in triplicate and are representative of the experiment repeated at least 4 times.
