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In the area of virology, we are developing therapeutic viral entry inhibitors, which are molecules designed to inhibit the ability of viruses to enter certain types of immune system cells. HIV is the virus that causes AIDS. PRO 140 is a monoclonal antibody designed to target the HIV co-receptor CCR5. Receptors and co-receptors are structures on the surface of a cell to which a virus binds in order to infect the cell. We are also involved in research to develop a vaccine against HIV infection and a therapeutic for hepatitis C virus infection.