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The HN169R mutation caused higher fusion than HN. (A) A fusion assay was performed on 293T cells transfected with the indicated plasmids that coexpress enhanced GFP. (B) GFP images were taken at 24 h posttransfection. (C) An NA assay was performed on 293T cells transfected using the indicated HN version of the plasmids. Data are representative of two or three independent experiments.
