Direct Answer • Key Takeaway
Cd3 (Cluster of Differentiation 3) Is a Protein Complex and T Cell Co-Receptor That Is Involved in Activating Both the Cytotoxic T Cell (Cd8+ Naive T Cells) and T Helper Cells (Cd4+ Naive T Cells). .. . the Tcr, Cd3-Zeta, and the Other Cd3 Molecules Together Constitute the Tcr Complex.