FIG. 1.

The secreted and membrane-bound forms of the RSV G glycoprotein. Vertically aligned rectangles represent the same amino acid sequence but differ with regard to being secreted (upper bar diagram, dotted) or membrane-bound (lower bar diagram, shaded). The transmembrane domain (TM) is depicted in black. The sequence of the first 100 amino acids of the protein is shown at the bottom to illustrate the two alternative translational start sites at Met-1 and Met-48, the transmembrane domain, and the new N terminus that is generated at asparagine-66 by proteolysis (24, 39).