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Syncytium formation in CHO and sialic acid-deficient Lec2 cells induced by wt F and L289A-F with and without HN. In all monolayers, the indicated proteins are expressed from the pCAGGS expression vector. In the top row, the indicated proteins are expressed in CHO cells. In the bottom row, the indicated proteins are expressed in Lec2 cells. The monolayers were fixed with methanol and stained with Giemsa stain at 18 h posttransfection.
