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Fusion properties of the recombinant spike proteins containing CD truncations. Subconfluent monolayers of OST7-1 cells were infected with vTF7.3 and transfected with the plasmids encoding MHV S protein and the recombinant SΔ12, SΔ25, and SΔ35 CD truncation proteins. At 6 h pi the cells were overlaid with LR7 cells and at 9 h pi pictures were taken.
