> See also: > - [[T-Cells]] # T-Cell Receptors (TCRs) ![[Pasted image 20240220020941.png|400]] ## Signal Transduction Several *co-receptors* are found next to the TCR: ![[Pasted image 20240220021121.png|250]] The **CD3 protein complex** is composed 4 distinct chains: - *CD3γ* (CD3G), *CD3ε* (CD3E), and *CD3δ* (CD3D) - *CD3ζ* (CD247) - Also known as ζ-chain, or CD3 CD8 and CD4 receptors are NOT TCRs