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Syncytium Formation Induced by Expression of R- MLV Env. HEK 293T cells were transfected with a plasmid directing the expression of R- Env (A,B) or wild-type Env (C). Forty-eight hours later on’mouse cells were added to the cultures. The cultures were fixed and stained 3½ (A) or 24 (B,C) after addition of mouse cells (from ref. [48]).
