This surface coat is a monolayer of millions of variant surface glycoproteins (VSG) that protect the parasite from the innate immune system and, through antigenic variation, against the specific host immune response. (nimbios.org)
The protruding orange structures are surface glycoprotein trimers, which allow HIV to bind and fuse with the host cell. (scientificamerican.com)
The annually updated trivalent flu vaccine for the 2005 - 2006 season consists of hemagglutinin (HA) surface glycoprotein components from influenza H3N2, H1N1, and B influenza viruses. (sciencedaily.com)