FIG. 1.

Schematic diagram of the HRSV (strain Long) fusion protein. The two disulfide-linked F protein subunits, F₁ and F₂, are indicated; the arrows point to proteolytic cleavage sites. The black boxes represent the signal peptide, the fusion peptide, and the membrane anchor. Heptad repeats A and B are shown as hatched boxes. The locations of the six potential N-glycosylation sites are indicated by arrowheads. Closed arrowheads point to sites that in this study were shown to contain oligosaccharides.