These are made of a viral envelope containing two main types of glycoproteins, wrapped around a central core.

It forms a coat inside the viral envelope.

Many are structural, forming the viral envelope and capsid.

The epitopes of the viral envelope are more variable than those of many other viruses.

Embedded in the viral envelope are proteins from the host cell.

Functionally, viral envelopes are used to help viruses enter host cells.

Some differences also exist in the lipid composition of the viral envelope of the two forms.

Env is a viral protein that serves to form the viral envelope.

It then mediates fusion of the viral envelope with the endosomal membrane.

The viral envelope also has surface projections that are small, 8 nm, and evenly cover the surface.