CD3蔚 is a subunit of the CD3 complex, which is a critical component of the T-cell receptor (TCR) complex on T cells. Together with CD3纬, CD3未, and CD3味, it forms the TCR-CD3 complex that plays a vital role in coupling antigen recognition to intracellular signaling pathways. This complex is essential for T cell activation, proliferation, and differentiation. CD3蔚 contains an extracellular immunoglobulin domain, a transmembrane region, and a cytoplasmic tail with an immunoreceptor tyrosine-based activation motif (ITAM). Upon antigen recognition, the ITAMs in CD3蔚 are phosphorylated, initiating downstream signaling cascades that lead to T cell activation. Additionally, CD3蔚 interacts with other signaling molecules like Lck and Nck through its unique motifs, further modulating T cell responses. Its importance in T cell function makes CD3蔚 a target for immunotherapies, including cancer treatments and autoimmune disease management.