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Cell-cell fusion. Cell-cell fusion assay was performed as previously described (26). XC cells were cocultivated with human 293 cells expressing the indicated Env/R-less. The panels shown are representative of two independent experiments. No syncytia were observed in cocultures of parental 293 and XC cells. The photomicrographs of the cells were taken by using an Axiophot microscope (Zeiss). Magnification, ×100.
