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Extent of cell fusion elicited by four different SLAM-blind viruses on EpR-expressing H358 cells 2 days after infection. Phase-contrast pictures of the cells were overlaid with fluorescence microscopy images. Panels show representative pictures. Bottom numbers indicate the number of nuclei per syncytium (averages of nuclei count in 20 syncytia per virus); standard deviations are indicated in parenthesis.
