+Cd3 is a crucial protein complex found on the surface of [T cells](/wiki/T_cell), integral to their role in the [immune system](/wiki/Immune_system). It acts as a signaling partner for the T cell receptor, initiating cellular responses to recognize and fight off pathogens.
+## See also
+- [T Cell Receptor](/wiki/T_Cell_Receptor)
+- [Lymphocyte](/wiki/Lymphocyte)
+- [Antigen](/wiki/Antigen)
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