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    GlossaryCD4 (T helper cell)

    protein on immune cells crucial for signaling and HIV entry

    CD4 is a type of protein found on the surface of certain immune cells, such as T-helper cells. These cells play a crucial role in the immune system by signaling other cells to perform their functions. CD4 is also the primary receptor that HIV uses to enter and infect these immune cells, which can lead to a weakened immune system.

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