FIG. 1.

Primary structures of the G surface glycoproteins of HMPV strain CAN99-80 and HRSV strain A2. CT, cytoplasmic tail (hatched box); TM, transmembrane anchor (black box); ED, extracellular domain (open box); His, eight histidine residues attached to the C terminus of HMPV G protein (dotted box).Upward-facing arrows identify the potential acceptor sites for N-linked carbohydrate. For each G protein, the 26 potential acceptor sites for O-linked sugars predicted to be the most likely to be used are indicated as downward-facing bars.