FIG 6.

Aromatic ring of Y336 plays a stabilizing role for the conserved DB. (A) Shown are the cell surface expression detected by three different gH antibodies (E1D1, CL40, or CL59) with standard deviations from three independent experiments. (B) Shown are the fusion activity for epithelial and Daudi B cells with standard deviations from three independent experiments. The CELISA and the virus-free cell-based fusion assay were performed as described for Fig. 3. (C) Soluble gp42 binding assay. The soluble gp42 binding assay was performed as described for Fig. 5C. Shown are averages with standard deviations from three independent experiments.