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A mutant with alterations in the cytoplasmic tail of gB exhibits a superhigh initial fusion rate. (A) Surface expression of the LL871/872AA cytoplasmic tail mutant. (B and C) Kinetics of fusion of the LL871/872AA mutant over the first 20 min (B) or over 8 h (C) in comparison to those of WT gB and gB H657R.
