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| A protein on the surface of certain immune system cells, including CD4 T lymphocytes CD4 cells. CXCR4 can act as a coreceptor a second receptor binding site for HIV when the virus enters a host cell. see also coreceptor, fusion, life cycle | |||
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| A protein on the surface of certain immune system cells, including CD4 T lymphocytes CD4 cells. CXCR4 can act as a coreceptor a second receptor binding site for HIV when the virus enters a host cell. see also coreceptor, fusion, life cycle | |||