Related words. 1  high technology noun. 2  push technology noun. 3  technology therapy noun. 4  appropriate technology noun. 5  information technology noun. 6  intermediate technology noun. 7  clean technology noun at cleantech.8  blind someone with science/technology phrase. 9  modern technology. 10  the frontiers of knowledge/science/technology.0% of the time, speakers of English use just 7,500 words in speech and writing. These words appear in red, and are graded with stars.
Two receptors, CD4 and a co-receptor act sequentially to trigger fusion of viral and cellular membranes and confer virus entry into cells. For HIV-1, the chemokine receptor CCR5 is the predominant co-receptor exploited for transmission and replication in vivo.
CD4 is a protein on the surface of the T cell. HIV's gp120 antigen is a mirror image of the CD4 protein. If HIV bumps into the right place on the T cell's surface, the gp120 of the virus will lock onto the CD4 site of the T cell (Figure 4). Because of this, CD4 is called the receptor site or docking port for HIV.