+CD4 is a cell surface glycoprotein, a marker of certain [T helper cells](/wiki/T_helper_cells). It plays a crucial role in immune recognition and serves as a primary entry point for [HIV](/wiki/HIV) into host cells.
+## See also
+- [Immune System](/wiki/Immune_System)
+- [T Cell](/wiki/T_Cell)
+- [MHC Class II](/wiki/MHC_Class_II)
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